Hi! Quick question for some advice really.. My boiler (CDI35i mk2) is knackered, expansion vessel broken, blockage in secondary heat exchange, pump worn, auto-bleed valve stuck, etc etc. 15 year old, never serviced, dodgy install by previous occupants mate syndrome! So, it loses pressure rapidly - mostly dumped out the back through the pressure release from water boiling in the heat exchanger, or the lack of expansion capacity from the expansion vessel meaning the increased pressure from the hot water has nowhere to go. I'm getting a new one in the summer - so just need this one to get me by for a few months. Obviously, it behaves much better when it has pressure - but it's spitting out a 2 bar pressure rise in a matter of days. Up to now, I've been topping it up almost weekly - just until I can get the new boiler - but recently the valve (small, horrible flexible plastic thing) has started sticking open. Any tips on how to manage that? There is no cold-water isolator for the boiler, so unless I'm mistaken, once it snaps and refuses to budge, that's it. Mains water off, drain system fudge however I can, or have mains pressure water pouring out my expansion vessel and pressure relief overflow. Does anyone have any knowledge of those boilers have any other options for when (not if) it gets stuck open? Cheers!