Where can I find who I had mortgages with
Your own records.And if you are doing this for some try-it-on complaint with a CMC then be on guard. The uphold rate is on these is just single digits and some CMCs end up landing you with a bill despite there never really being a case in the first place. Also remember that mortgages were only regulated from October 2004. Both the FOS and the FSCS have been highly critical of claims companies putting in fake mortgage complaints.
Be careful when converting points to Cineworld
...and it's essentially NO FEE
Via its Advent calendar (norm £59 delivered)