Oh also forgot to say, bathroom hot water quickly, kitchen long wait, then you have all the hot water in the pipe that goes cold, 30mins later want more hot, long wait again then more waste.
Are all your hot water pipes insulated???
Thats an easy partr to leave out for those who are looking for cheapness instead of quality!
Any boiler in loft should have a permanent retractible ladder so access should be easy!
Tony