Hi all. I have recently installed a Worcester Bosch Greenstar 30Si. It's a pretty good boiler, uses less metered gas then my old Vailiant ecotech but seems to use a bit more electric. Anyway, it has an unnecessarily complicated method of re-pressurising the system that involves a provided filling key. The key needs to be pushed into a tube on the boiler then turned. Then another part needs to be turned as well. What they don't tell you on the brochure is just how hard you have to ram the key into the tube in order to get it to engage properly. Talk about childproof, it was almost adultproof! If you don't get a tight fit when you turn the filling knob, water will escape. It could be stiff because it's a new boiler but even if it loosens in future, the old screw cap valve on my Vailiant was soooooo much easier. Not to mention what happens if I lose the filling key. I'm tempted to just leave it in the boiler tube...