The US general optimal play is to surrender 16 against 9/10/A and to surrender 15 against a 10.
If you have found a UK table offering this (i.e. they do not have a hole card) then you should be much more liberal with surrendering e.g. against an ace.
Either way the EV of surrendering/not is generally marginal.
At DTD I surrendered against an ace, but lost the whole bet when the dealer made blackjack.