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I haven't asked. It's not easy to 'get into the installation, and the company who installed it will be the only ones who can judge the cost - and I don't trust them to do the job, or estimate the cost.
Your 'service' - it's not easy to see what you are offering - I'll make some enquires through my usual 'gas fitter'. It's not your fault - but I don't know what you will charge - better to back out now before I get stuck with with additional charges.