firing up Sime Friendly Format 80E boiler?

We are tidying up, and cleaning my deceased mother-in-laws house, unfortunately the boiler has been turned off. by others, a couple of days ago and the electrics also turned off at mains. The electrics is turned back on, however we cannot find the manual does anyone know the correct procedure to get the boiler to turn on for the hot water?
Any help greatfully accepted.