The planter'spencil ledger.

Mr Wijeratne keeps the estate ledger in pencil. He has done so since 1985, when his father retired and the small column of ink figures gave way to a softer, correctable hand. He says ink is for promises and pencil is for daily work. The factory floor agrees with him.

We arrived at six. The leaf was still wet from the night and the women were already on the lower slope, two-leaves-and-a-bud, the back-of-the-hand motion that has not changed in a century. Mr Wijeratne did not greet us. He raised a finger to indicate he was counting baskets. When the count ended he said good morning and offered tea, which was, of course, theirs.

What we ask of a tea morning here is not to learn how tea is made. That is straightforward and the books will tell you. We ask only to be in the company of a person who has done one thing slowly and carefully for forty-one years. There is something a guest takes from such a room that no itinerary can quite name.

When you visit, do not photograph the pluckers without asking. They will agree, almost always, but the asking is the point.

What a tea estate morning actually involves

The plucking starts before the visitors do, which is the first thing to understand about arranging one of these mornings. The gangs are on the slope by around six and the day's leaf has to reach the factory while it is still fresh, so the property is running at its own pace long before anyone arrives to look at it. Turning up at ten gives you a factory mid-process and a hillside that has already been worked. Turning up at six gives you the estate as it actually is, which is quieter, colder and considerably more interesting.

A proper visit is not a tour. There is no route, no signage and nobody whose job is to explain things to you, and that is the point rather than an oversight. What you get instead is permission to stand in a working building while it works, and somebody willing to answer questions if you ask them. Guests who want a narrated experience are better served by one of the larger estates that runs a formal visitor operation, and we will say so.

How the leaf becomes tea

The process is short and almost entirely physical. Fresh leaf arrives at the factory and is spread across withering troughs, where air is drawn through it for hours until it loses much of its moisture and turns limp enough to work. It is then rolled, which breaks the leaf and starts oxidation, the stage that turns green leaf brown and builds most of what you eventually taste. Oxidation is halted by firing, a pass through heat that dries the tea and fixes it. What comes out is sorted by particle size into grades, which is what the paper trays in the grading room are for.

Grade describes size rather than quality, which is the most common misunderstanding about Ceylon tea. A broken grade is not inferior to a leaf grade; it brews faster and stronger and is what most people actually drink at home. Elevation does far more to character than grade does. High-grown tea from these hills is lighter and brisker, low-grown tea from the south is darker and heavier, and any estate manager will demonstrate the difference in ten minutes if there is something in the tasting room to demonstrate it with.

When to go, and what to ask for

The factory only runs when there is leaf to process, which sounds obvious and catches people out constantly. Plucking continues through the year but volumes rise and fall, and between flushes a factory can stand quiet for days. A silent factory is still a beautiful building and it is not what you came for. This is the single most useful thing to establish before committing a morning to it, and it is not information you could look up anywhere.

Ask for the weighing room rather than the machinery. The machinery is impressive and largely self-explanatory; the weighing is where the estate's arithmetic actually happens, where the day's baskets are recorded against the names of the people who filled them, and where a ledger like Mr Wijeratne's earns its keep. It is also the room in which you meet the pluckers rather than watch them from a distance, which changes the character of the visit entirely.

The etiquette

The rule in the opening section is the important one and it is worth expanding. The pluckers are at work, paid against what they pick, and a visitor standing in the row is a visitor slowing somebody's day. Ask before photographing, accept a refusal without negotiating it, and do not hand out money or sweets in the field, which creates a problem for the estate the moment you leave. If you want to give something, give it through the manager, who knows what the welfare fund actually needs.

The other courtesy is time. An estate that agrees to a private morning is absorbing an interruption into a working day, and the difference between a good visit and an intrusive one is largely whether the guest treats it as an appointment or as an attraction with opening hours. Arrive when you said you would. Leave before you have outstayed it.

It is worth knowing whose work you are watching. The plucking workforce in these hills is largely Malaiyaha Tamil, descended from labourers brought from southern India in the nineteenth century to open the estates, and the communities living on the properties today are their families several generations on. The line rooms, the estate school and the crèche you pass on the road are part of that history and are still in use. None of it is hidden, and most managers will discuss it plainly if asked, but it does not appear in the tasting-room version of the story, and a guest who knows it is standing somewhere quite different from a guest who does not.

Where the estates are

The hill country divides into regions the trade takes seriously and visitors mostly do not. Hatton and the valleys around it, Dimbula, Nuwara Eliya, and Uva on the far side of the watershed: each produces a recognisably different cup, and the differences follow elevation, rainfall and which monsoon reaches them. A guest with genuine interest is better served by two estates in different regions than by three in the same valley, which is a distinction most itineraries never bother to make.

None of this requires expertise to enjoy. What it requires is somebody on the ground who knows which manager will actually open the weighing room on a Tuesday, and that is a relationship rather than a booking. We keep a short list, and it is short for much the same reason the ledger is kept in pencil.

On taking some home: buy at the estate if the estate sells, and buy the grade you actually drink rather than the one that sounds most impressive. What is sold at the factory is generally fresher than what is sold at the airport, and considerably fresher than what has been sitting in a supermarket. Ask for something from the current month's production. If the manager suggests a grade you have never heard of, take it, because that is the one recommendation in the room with no commission attached to it.