Went to my local Sainsburys and bought the own brand Apple Cider Vinegar (£1.15). Was convinced there was no way it would work but I've had my warts for 5 months and there were so many, it was so demoralising.
Got a cotton bud, soaked it in ACV (undiluted) folded it up and rolled it between my butt cheeks while I was on laptop in bed. It sting like nothing else, and I sat like that for two hours. I had a feel before bed and they seemed to bigger. I was so disheartened.
Next day I woke up and 90\\% of the warts were gone. I couldn't believe it, it was amazing. Some of the bigger ones are still there but oh my days if it hasn't made a difference. No longer itchy and so smooth, I spent the whole day in an amazing mood.
I've found that it burns quite badly on the second day, the skins a bit sensitive so I'll probably scale it back a touch - but oh my goodness if ACV hasn't been the most amazing remedy. I'll keep doing it and hopefully get them all - but that pain is oh so worth it to get that piece of mind back.