Birth and Marriage certificate translations.
I haven't authenticated it but I have read somewhere this morning that if you were born and married in UK then the registry office can issue copy certificates with translations for about £10.
If true then it could work out considerably cheaper to order those than pay for originals or copies in hand to be translated locally.
Personally I have no need but if anybody is then it seems like it might be worth looking into.
I'm afraid you'll have to do the legwork yourself though, I'm just throwing it out there.