After the Gas Escape was fixed did the Engineer Purge the pipework, sounds like there is air in the gas Supply, as for BG Quoting £210 ? Did they quote that over the phone? Our Company Charges £72+Vat for a Call-out with 1 hour on site after an hour we charge by the Half hour, I would get a Local Independant Engineer to Have a Look make sure he holds WTR1 cert on his card!
www.elanar.co.uk, August 2009