Search for any of the following part numbers - not being in the UK, I can't say who is a good and [re]liable company that will ship to your location: U8735NU209 
Hi, I  need a replacement for my faulty battery in my PE2950 server. Do you know any trusted and liable company in UK aside from DELL who are selling this item. They need to ship it from UK to Bahrain. thanks, Jess
raid controller battery