the operator of the premises is responsible for the access arrangements to their premises.
therefore the financial cost is on the shoulders of those people, and that is where the problems start.
we as employers owe a duty of care to our employees re all relavant H & S matters, risk assessments, method statements etc.
whether a disabled employee, would have a valid case against their employer if they were the appointed operative for a building that they could not reasonably access, well thats one that would have to be tested in court.
and lets be honest about this, in todays world it probably wont be long before we saw something like this in court.
regards
martin