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Just re-read my post and had to laugh as it does sound as if I am taking them on holiday (ha ha).
Thanks for all the replies. I have bought a property abroad and for some reason, curtains over there are extortionately priced. I was worried about getting the wrong size -because there are two sets of curtains and they weigh 7.5 kgs per pair, and I didn't fancy having to lug them all the way home again to have them altered.
For those who asked about where I bought them, it was from T J Hughes (Scunthorpe), but I assume they are nationwide. There is also an online store but they do not have the same ranges. The curtains are made by Rectella so perhaps you could find a Rectella stockists. The curtains I bought are 112" wide and 108" drop.
I think I panicked when I just read that for a 90" window pole you should get 90" wide curtains. Thanks again for putting my mind at rest.
Cheers