No part of the heating system works – boiler, timer clock, etc. all stopped.
Someone has accidentally switched off the heating master switch on the wall in the kitchen, below the boiler.
What you can do
Check the switch. If it is in the ‘on’ position, check the RDC (‘fuse’) box in the cupboard under the stairs.
If this does not work
You will need help from a professional plumber to track down the problem.
See the recommendation re Wapping Plumbing on the general Heating page.