This is an example of a complaints register for an FCA investment management firm. It's been designed, in Excel format, to save you time in setting up your own register from scratch, with all the columns the FCA would typically expect to see. You'll need to tailor it for your own purposes but it should give you a good headstart.
Once purchased, you can use/alter/amend for your own investment firm on a perpetual licence basis. Not maintained.