Photobox accepts hi-res and I have always been happy with the quality of prints. This was who Boots used to work with, but they went their own separate way a few years ago.
I've only used them for people and car pictures, so I cannot be sure they'll be up to muster for what you're after.
I think you get a certain amount of free prints when you sign up (I did) so it might be fairly low risk to give them a go!
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