Western General Hospital - Edinburgh
Imperial
UCL
KCL
MRI - Manchester
Addenbrooke's - Cambridge
Radcliffe - Oxford
Queen Elizabeth Hospital (brand new and expensive + Malala went here) - Birmingham
Honestly, anywhere, but if you had your pick i recommend the above. Pick a hospital that has strong consultants and a good patient case/base, preferably one that performs advanced procedures and is a tertiary or quaternary referral center.