Just cut the first tea towel off and hemmed it. It's a bit smaller than I would have liked, but still quite usable - 33.5cm x 59cm before washing.
From a quick measure while damp after washing it looks like the finished dimensions are 32 x 55. It may end up turning into a hand towel or something, if it doesn't seem big enough to be useful.
I'll have a look at it tomorrow, but I'm thinking it's likely that I'll be resleying - it doesn't actually look too tight, but I think it could possibly get away with being a bit looser anyway.