Yeah, I wasn't expecting it to charge me, but this seems to be the only thing that I can see that it could be.
Was charged £135.77 (or something like that) whereas this was supposedly working out to £131.40 (again, rough estimate) but sometimes my bank will charge a tiny percentage more if it's an overseas payment (charges me an extra £1 if it's to Amazon US for example) so figured it must be this
xx