Unable to sell home due to solar panel insurance issues

This company has to be one of the most unethical companies I've ever come across and appears to have no accountability to any governing body. My house has leased solar panels installed by the previous owner and owned by A Shade Greener. Unfortunately the solicitor engaged when I bought the house four years ago failed to point out or warn me about any potential problems with leased solar panels. I'm a pensioner on a fixed income in remission from cancer and now need to downsize for both health and financial reasons. However, I find myself unable to sell my house (as I have a legal obligation to inform any prospective purchaser of the problem we encountered when I found a buyer last year) and there are still 17 years left on the lease.

All the usual problems with mortgages were sorted out but on seeing the lease itself my buyer requested clarification on a few points, one of which was "does the solar panel company's insurance policy cover damage to the property if it's caused by their system". He was concerned about the possibility of legal disputes arising should the solar panel system cause damage to the property/contents. There's a clause in the lease saying the Tenant (ASG (F7)) must supply the Landlord (homeowner) with details of their insurance so we requested that from them. They sent summary sheets showing Public Liability and Employers Liability insurance in the name of another ASG company, ASG Maintenance, and despite repeated requests from my solicitor and from myself to provide more information to answer my buyer's question they steadfastly refused to do so.

They also refused to make a simple written statement stating whether or not they held insurance that would cover damage to the property if it was caused by “the system” or to do anything to help the situation despite knowing that the house sale was about to collapse because of this issue.

For that sole reason my buyer then withdrew from the house purchase on his solicitor's advice because of possible future legal disputes concerning insurance liability despite loving the house and waiting six months for the sale to go through.

A Shade Greener are listed as members of the RECC (Renewable Energy Consumer Code) so I contacted them in the hopes of resolving the problem via their dispute resolution team. However, it turns out that there are over 60 different ASG companies and none of them involved with my lease are registered with the RECC so they have no requirement to follow any code of conduct.

It appears that ASG don't hold insurance to cover any damage to my home and/or contents if caused by their solar panel system and my homeowners insurance doesn't cover it either as the panels are not owned by me. Their best advice was to take out as much insurance as possible including legal expenses and basically hope for the best and be prepared for a possible legal dispute. I have since heard that this scenario did actually happen to someone and they couldn't make any claim for their loss. So I'm faced with the prospect of spending the next 17 years living in a house that I can't afford to run that's potentially uninsured anyway.

This really shouldn't be happening in 21st century Britain.