Any idea how long Thai surface mail say a 10KG package takes to get to UK, and roughly how much said would cost.

By surface mail it will take about 3 months.

Sorry I don't know the cost.

The main Post Office on soi Post Office or the smaller PO in Na Klua would be pleased to tell you the rate. It might be more cost effective to send say 5 kilos instead of three for example, so ask the rate for 1, 2, 3,4 kilos etc.

If you want to please any stamp collectors you might know at the parcel's destination, then the Thai PO recently produced some nice 100 baht stamps, gold ones featuring Rama 5, and a few of them on the parcel and thus genuinely postally used would be appreciated.

Derek