Think it's sorted now. Managed to find instructions on internet about resetting wireless signal.
http://www.worcester-bosch.co.uk/homeowner/products/boiler-controls/which-controls-go-with-my-boiler
This seems to have the boiler running reliably again. Would also explain the absence of a fault...
By the way, called a few people that were recommended over past few days but non available to come until Tuesday at earliest.
Wondering if there was a quick or obvious solution to help?
Thanks
What are the problems?
1. The boiler has become increasingly temperamental over the past week.
Water seems ok, although now heating not coming on.
The blue light comes on (not flashing to indicate fault) but nothing happens after that. At best, it might sound like it was trying to start up...