I had a cave student, so certified full cave, so diving a drysuit who was there on a businesstrip. She was refused on that easy recreational overrated and overexpensive sportsdive because she did not have a drysuit cert. She contacted me because 10 signed drysuitdives by an instructor are also enough. But because in here logbook only cave was mentioned, and we had pictures of already caves and a trip to malta in drysuit, they still wanted to SELL a drysuit course. I answer the email with that we had done over 30 dives in drysuit together, that I am instructor, that you can find all pictures on that website. But it was that they still wanted a cert.
I really cannot agree with such selfmade rules if a diver can proof on pictures and technical certs that they have drysuit experience (and the funny detail: SHE CAME WITH HER OWN DRYSUIT). This has nothing to do anymore with safety then. Was 2 years ago, so maybe changed now. Don't know what divecenter.
Diving in a wetsuit in this cold water could be done for about half an hour. But it limits your fun and divetime and you must be used to dive such cold water in a wetsuit. Even is you dive normally in 5 degrees C water, the 2 degrees is way much colder. So I understand why people need a drysuit to do this dive.
Drysuitcertification is not required to do any techdiving. So most technical divers here don't have a drysuit cert, but all dive in a drysuit.
I got mine when buying my first drysuit, never saw any instructor, but I have a drysuit cert. LOL.