Problem with my Baxi Bermuda 401?

System was working great, then I serviced the hot water tank in the airing cupboard and replaced the thermostat on it and cleaned it out, put everything back together and it worked find water got hot it was fantastic. The next day the wife was vacuuming around the Baxi Bermuda 401 boiler she said the pilot is not on, now the pilot will not stay on neither will the boiler ignite. I have changed the thermocouple pilot will still not stay lit when grey switch released. I have cleaned the jets blown through the gas supply pipe to the pilot light, is clear. But pilot still going out when button released. Any suggestions please, can't afford a plumber at moment as I'm off work due to an accident.