Looks to be nationwide at independant Pandora approved retail stores and Official Pandora Outlets.
Go on Support your Local Jewellers! Not the Bigger Stores!
Basically Spend £125 in a single transaction on Pandora and get the silver Bracelet worth £60 free.
For anyone local to Burton-on-Trent I know Oliver James Jewellers are definetley doing the event this Saturday 7th of May as I have seen the flyers and the posters up and the wife is hinting.
Seems like a good deal to me, It can't be exclusive to the Burton store but I can't comment on others so may be worth checking your area.