Bill Upchurch retired from doing installations in 2021. He is still available to give technical support.
He retired from installations to free up time in this retirement to do a web site on Climate Change Info www.ccinfo.org.uk It is worth while looking at the section on insulation especially with the high cost of heating.
See about Wall Rock internal liner to stop mould by DIY £11 a square metre and to reduce the heat loss through solid wall houses by 25%. DIY £23 a square metre.