Just used the number in two calls, as I am currently shivering in the UK. Seems better than the number I have been using for the past year or so - 0844 5626262.
Clarity better and cheaper.
Note that the end cost is NOT 1p per minute, which is the additional cost of routing to Thailand. You also have to pay for the standard connection fee to the 0844 service, which depends on your service provider and can add up to 8p per minute from some UK mobile operators.
Anyway, at least I am back to BKK on Tuesday...