I can warmly recommend Mark Sikora, a financial advisor based in Islington. He has helped us lots of times. Is totally amenable, honest and easy to work with. 020 7288 6400/
mark@gmpifa.co.uk. First time I saw him there was a scheme where you could have a free consultation with an independent financial advisor. Worth checking if that still applies
Otherwise I found Purely Mortgages helpful. Was a few years ago now but contact was Kirsty -
Kirsty.Geddes@purely.co.uk. She was very helpful and happy to respond to many questions
Good luck