This is one of the handful of threads where I've seen a few OTC experiences discussed.

Boy, are they hard to come by - https://old.reddit.com/r/BitcoinMarkets/comments/8ecm6h/otc_what_are_your_experiences/?sort=confidence

If you don't already you should keep an eye on here - https://old.reddit.com/r/BitcoinUK/  as cashing out experiences and bank discussion turn up fairly regularly.