Sorry, another boring double glazing question..
5 companies have now seen and quoted (or quotes in the post) - all said they could double glaze our flat from inside. (2 of our 6 windows can't be accessed externally anyhow.)
6th company said 'No way we can double glaze a 5th floor flat without scaffolding, health and safety law would never allow it'

Phoned Council Building Control - not their job
Phoned HSE - they didn't seem to think there was a specific law against double glazing a 5th floor flat from inside without scaffolding. They said to check the company had done it before and suggest they put signs up below.

Am I worrying about nothing again? Or are the 5 companies cowboys
Mr P, if you're there, would appreciate your trade knowledge (or anyone else)