When I got my recirc, i just called IMC in wembley and the booked me in. I dont think you need a referral, unless youre going to a private urologist in hospital. Just call one and ask.
46 UK here & looking into it now as cant pull the foreskin back over the head at all! I'm looking at going private too knowing what NHS waiting list times are like

did you still have to get a referral from your GP as I phoned up Nuffield Health today & was told i still needed one from my GP before i could see a private consultant