Only just seen the most recent comment from you but was going to suggest giving Tri-Mar in Camborne a try. They usually have a good selection of stock and they`re a good company too
I'm not a Tri Mar fan - I know he has a very good reputation with many people in the area but I have reservations. I don't see many happy looking fish in his tanks; and there are no shortage of fish in any of the tanks.
My 3 Otos arrived this morning - first time I've had fish by mail, I was a bit nervous. All 3 arrived in great condition and have settled in well. Funny little guys!