Hi. Need something sent incredibly from the UK to Bangkok- what's the quickest international shipping (it's not a package, it's just letter sized). Is DHL the best bet? FedEx? Some other clever way? Any help would be much appreciated.

Normal Airsure or International Signed For takes about five days.

If you need quicker. look here

Some examples based on a package to NY:

Cheapest Worldwide Delivery: New York. 2-5 days, 10 kg

Worldwide Parcel Services* is £38.02 via DHL in 2-5 days; then Transglobal Express is £38.95 via DHL Air Express in 2-3 days, with good feedback. Next, ParcelsPlease* is £43.40 via UPS Worldwide Express Saver in 2 days.

Alternatively, Pharos Parcel also has good feedback, and has an Express Saver at £47.72, in 2-4 days by UPS. Then there's Collectmyparcel at £49.24 via DHL in 2-4 days. Interparcel is £50 with FedEx Economy, delivered in 2-5 days, and has good feedback. Source: MoneySavingExpert

Just do a search on the company names to see what prices and options they offer to Thailand.