Stan, It is hard to tell, but your water looks cloudy, but I think your algae bloom is dead.
So what I think is going in is one of two things, maybe both.
(you never did give us a hardness/calcium hardness reading, did you?)
1) Dead algae which means you need to run your filter 24/7 and clean it out when the pressure rises. I don't know if they sell "skimmer socks" in the UK, but if not you can line your skimmer with a piece of ladies' pantyhose. It can help pulling particles out. If you have a sand filter you can add a little DE powder, just enough to raise pump pressure 1 psi. All this is to filter dead algae.
2) You could also have calcium clouding, depending on your calcium hardness reading, given your total alkalinity is so high. Try lowering your pH to 7.2 ( no lower as it may be overstated by your chlorine level) and see jf that helps. Follow our method for lowering T/A to get it down to around 100 and see if the water clears. A very high T/A, over 200, and a high CH, 400-500 ppm can cause milky cloudy water. It isn't dangerous but it is ugly.

Again, either could cause cloudiness.