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Thanks builder -useful. I found this on Energy Trust site which fits in with what you said.
" Call your local Energy Saving Trust advice centre on 0800 512 012 for details of installers in your area.
For a list of registered installers go to the competent person website, SNIPEF, or centralheating.co.uk.
For gas and LPG boilers, the installer must be Gas Safe registered. For oil boilers we would recommend that you use an OFTEC registered installer. You can find registered installers at these web sites:
www.gassaferegister.co.uk
www.oftec.co.uk
It’s worth getting three quotations from installers. You may also want to check that installers:
have a local office
have been in business locally for several years
have customer references that you can check.
The Heating and Hotwater industry Council website at centralheating.co.uk also has advice and information, including a useful list of what should be included on a quote, and everything you should be told after your new boiler is fitted.
Your registered installer will ensure that your system complies with Building Regulations, and will make sure you get all the documentation to prove this. Keep these documents safe – you will need them when you sell the property."