If it were me, Id
1. Get boiler from BG, tell them to stick the power flush £800 is taking the proverbial.
2. If the system is really that bad, then I'd get a local chap (must have friends or colleagues that know someone trustworthy) to power-flush and add magnetic filter.
3. Then use them in the future for servicing and any issues you may (but are VERY unlikely) to have, and bin the home care from BG
4. Enjoy not paying out monthly for something not necessary.
1. Get boiler from BG, tell them to stick the power flush £800 is taking the proverbial.
2. If the system is really that bad, then I'd get a local chap (must have friends or colleagues that know someone trustworthy) to power-flush and add magnetic filter.
3. Then use them in the future for servicing and any issues you may (but are VERY unlikely) to have, and bin the home care from BG
4. Enjoy not paying out monthly for something not necessary.