you could try
Henk Wegstapel who's at the Spire Alexandra near Rochester (so not too far outside of London).
He talked to me about fibrin glue and didn't advise it in my case
I had my abcess/fistula sutured 3.5 years ago and recently have had the problems return so I'm being admitted on Monday for another small op. Hopefully this will just mean having the sutres replaced but wont know for sure until they get in there and have a poke/prod about.
Although I've been living with a seton suture dangling out of my bum (to be honest it's not noticeable and I rarely if ever these days moon people) I have to say that I hardly think about it, which at the end of the day is as good as you can hope for following bum related surgery in my opinion