It;s definitely not the flushing mechanism, the flap rises properly. I can only assume there is a foreign body behind where the water is released into bowl; just tried everything to get it out but without success.
I bought a flap up flush mechanism. However, I believe something has been dropped into the cistern and has ended up in the toilet and is blocking the flush holes. This means that the the flush is weaker than it should be. The toilet and the rest of the bathroom suite are a cream colour so renewing t...