Why a well-addressed envelope still counts

There is a particular pleasure in opening the letter box and finding a handwritten card among the bills. Someone chose the card, thought about what to say, wrote it in their own hand and walked it to a post box. It is a small act of care, and it lands far more warmly than an email ever could.

The only catch is that your careful words have to reach the right person, and that depends entirely on the envelope. Sorting in the UK is largely automated, and machines are literal creatures. They read what is written, not what you meant. A postcode tucked beside the stamp, a town name missed off, or handwriting that loops into illegibility can all send a birthday card on an unexpected tour of the country. Getting the address right takes two minutes and spares everyone a great deal of disappointment.

The anatomy of a UK address

British addresses follow a dependable order, and the golden rule is that the postcode always comes last, on a line of its own. A well-set-out address looks like this:

Mrs E Bennett

Flat 3, 42 Marlborough Road

Netherton

BRISTOL

BS12 7QT

Working from the top down, the first line is the recipient's name, including any title. The second line takes the house number and street, and if there is a flat or apartment number it goes first, separated by a comma. The third line is the locality — a village, hamlet or district — but only include it if it genuinely helps to distinguish the address.

• The post town belongs on its own line, written in capitals. This is often larger than the village you think of as home, so check which town the postcode actually belongs to.
• The county is no longer needed. It is not part of the postal address and leaving it out does no harm at all.
• The postcode goes on the final line, in capitals, with a single space in the middle and no full stops.

If your handwriting tends towards the decorative, write the whole address in block capitals. It looks less charming but it arrives far more reliably.

Postcodes: small print, big job

A full postcode identifies a handful of addresses, sometimes a single building, so it does most of the work. The outward code at the start narrows things down to a district; the inward code at the end pinpoints the street or property. Get those final three characters wrong and your card may as well be sent to the moon.

Write the postcode clearly in capitals, keep the characters evenly spaced, and avoid joining the letters together. Underlining or boxing the postcode does not help and can confuse the reading equipment. Use black or dark blue ink on a light envelope, and press firmly enough that the writing does not fade or smudge. Keep the whole address left-aligned in a neat block, with clear gaps between lines, and leave a margin of roughly 15mm around it so nothing is clipped during sorting.

The return address: your quiet safety net

Every envelope you post should carry a return address, even a card to your next-door neighbour. If the address is wrong, the recipient has moved, or the stamp is insufficient, undelivered mail can then find its way back to you instead of being opened and destroyed.

The traditional place is on the back flap of the envelope, where it stays discreet. You can also write it in the top-left corner of the front, provided you keep it well clear of the main address and the stamp. Give it the same treatment as the main address: full postcode in capitals, town name in capitals, nothing abbreviated. If the card is heading overseas, add UNITED KINGDOM in capitals on the final line, so the receiving postal service knows where the letter has come from.

A return address is also a kindness to the person receiving it. Wedding replies, party acceptances and cards sent to a new address all become far easier to acknowledge when the sender's details are sitting right there on the envelope.

Envelopes, ink and the practical bits

The envelope itself matters more than you might think. Pale colours and white are read most easily by sorting equipment; very dark or highly patterned envelopes can cause problems. Avoid glossy finishes that make ink smear, and steer clear of writing in pencil, which fades and smudges in the rain.

• Fix the stamp to the top right corner and leave the space around it clear, as the postmark needs room.
• Check the size, thickness and weight of your card. A bulky handmade card may fall into the large letter band and need a higher rate, so have it weighed if you are unsure.
• Square cards often cost more to send than rectangular ones, as they are sorted differently.
• Seal the flap properly rather than wrapping tape around the whole envelope, which can snag in machinery.

One last look before the post box

Before you seal the envelope, read the address back to yourself as though you were a stranger seeing it for the first time. Is the postcode in capitals and on its own line? Is the town name there too? Have you included the flat or house number? Does the recipient's name match what you have written inside the card?

Then check the return address is present, the stamp is the right value for the size and weight, and the whole thing is legible in good light. A moment's pause at the kitchen table is all it takes. Do that, and your card will arrive where it belongs — on the mat, in the right hands, and much appreciated.