We bought a house where the agents are YOPA. The only contact we've had with YOPA was when we made an offer, apart from that we've never had any contact apart from them chasing us (for no reason). We had to do the viewing with the owners because the agent was unavailable, and we moved into the house 2 days ago but YOPA still haven't given us the 2nd set of keys (we had to get the keys through the previous owners). I've chased a lot and have pretty much been ignored, sure it can't be legal for some random agent to hold on to keys we now own! Definitely changing the locks. Honestly useless, I'd never use them to sell a house.