You will of course need to state your complaint which is slightly different to mine. I would send the LBA. Under the Civil Procedures Rules which can be found here [not allowed to post link as have insufficient posts] but is on the justice dot gov dot uk site
you will see that there is a general protocol and then specific ones for more 'specialist' causes of action.
Under the general protocol "Steps before issuing a claim at court"
6. Where there is a relevant pre-action protocol, the parties should comply with that protocol before commencing proceedings. Where there is no relevant