So the people I'm buying the house off call me today and say; "there's a new document, it will solve everything, just read it and hopefully we can get the purchase going again."
Here are the best bits.
"As you are aware, the lease of your property contains the following restriction which prevents you from transferring or sub-letting the property to a person of less than pensionable age..."
"We can confirm that our client has no objection to you occupying the property"
"...however...This letter does not therefore constitute a formal variation of the terms of the lease."
"if the freeholder required our client to remedy a breach within the lease, then they would have no option but to take action."
Then, "please get the money sent over to us so we can sell you this flat which you will never be able to sell on again"
Basically, we promise not to force you to sell your house, however the people who own the property could still do so.
TL;DR: **** you, you *******s, you're not getting my money.