I do agree with you steve b, but to progress through the course i have to complete the sceanrios, they arent completely worthless as they do put you in the mindset of problem solving and thinking your way through the system set-ups to locate and rectify problems.
For anyone having trouble with the scenarios still, it is the float valve on the cistern supplying the hot water tank, isolate the float valve then drain the hot water, return to the loft and exchange the float for a new one. Turn supply back on and replace the lid, now you can go and freeze the pipe below the stopcock and replace it.