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Went to check and i could smell burning coming from it and it was really hot. Checked the others and they were fine. 
Depending on how hands on your are you can either try to take yours apart, clean them up and re grease the sliders or you can get a second hand caliper or a refurbed one and fit that. its not that hard a job but its likely all the nuts will be seized up. I guess a garage would charge £150-200 for it. You could also look at your discs and pads and possibly change those too. i would suggest you don't drive it with the caliper stuck on./ replacing the front caliper as you'll have uneven wear on your O/S and N/S.(http://www.brakesint.co.uk/) Part number BCA2079 (assuming you've got standard brakes) then a decent garage should only charge for an hour labour to swap the caliper and rebleed your brake fluid. 
I've replaced mine before so if you need any pointers then drop me a line!
guess it was only a matter of time before this one went too.& pads too, not cheap these calipers!£157.40 then you get £50 back if you take your old caliper back to them. 
- the only club to win 'Best Club Stand' at JAE more than once, and twice in a row!/ bracket - and 9-times-out-of-10 it's the sliding pins at fault, the caliper & pistons being fine.