We’ve got a guide about major works here: https://www.leaseholdersforum.org.uk/guides/heating-options
Really it depends on what they are doing – it may be value for money, or it may not. I can’t claim that recent consultation exercises that I have heard about have impressed me much to be honest, but that just means that leaseholders have to fight harder for the their rights to be respected.
There is a Ludham & Waxham Leaseholders Association – do you want me to pass your details on to them. That particular association isn’t currently showing up on the Camden’s website, so I’ll flag that up to the Chair of the association as I know him.
Kind regards, Paul