Based on:

 

a. Sale price
b. Plus additional for leasehold flat
Additional fees:
Copy of register from Land Registry
Freehold - £6
Leasehold - £12
* documents referred to in the register can cost between £5 and £23 per document, if a duplicate is needed
*note, extra expenses could occur on your property if:
Information (eg no planning permission/ building regs etc)
EPC (Energy Performance Certificate)