Seems odd that you couldn't get a caliper sorted anywhere but Denmark.
There are loads of places in the UK that do parts, to name a few...
not to mention the numerous breakers mr2 specialist breakers GTS Chris, Sbits, MR MR2, MR2Bitz etc.
Also a lot of the bigger breakers would carry bits for mr2s like www.traynors.co.uk/
in the North or MSI in the South.
Sign up to www.mr2roc.org
and put up a request there in the parts wanted section if you need anything in the future. They also have a group on facebook if you search for it, there are a lot of parts bought and sold on their and plenty of guys and gals willing to offer advice on there.