Hi guys Firstly...go easy on me! I’m a site basher, I’ve installed loads of Concealed cisterns but never had to fix one! I’m venturing into the world of domestic maintenance and it’s nerve wracking! So is it really possible to change a flush valve through the hole where the flush plate is?! I had a look at one today and it needs replacing, Cistern is behind fully tiled boxing. It doesn’t seem possible I can get it out the hole, but then it must do right? Otherwise what do I do? Thanks!