Only by BG as marketing, to the gullible. They're heating technicians; some are bad, some are good. BG want to sell you a power flush.
Probably, but you can't get much flow rate through a micro-bore system and you need a high water flow rate to entrain any loose particles. You might need to take radiators outside and flush them through with a hose. A magnaclean filter would help protect the boiler from sludge deposits. Flush the system and dose with inhibitor. Get quotes from local heating contractors, other than BG.
