Hi Tom,
the world's your oyster, I'd say. Unless you have a few more requirements
I'd imagine that as you only want one week you probably wouldn't want to go long haul but I may be wrong. How about Egypt as that will be really warm at the end of August and also only about 6 hours away.
I think we need a bit more info really such as how long a flight - do you prefer All inc, self catering or something in between?
I'm sure you'll get plenty of suggestions if you can give us a little more to go on