There isn't an inadequate supply of ICU beds, there are for enough beds for normal circumstances, it's unusual for there not to be an available bed, but one can always be found as there is a good network to locate a bed. It's not the ventilators that are the issue but the staff to man them. ICU beds are eye wateringly expensive to maintain, which is why the numbers are equal to the numbers needing them in normal circumstances. My friend works on ICU and is pissed off at being sent to work on wards as there are not enough critical care patients. Not at the moment of course, there are 2 to a bedspace now.
Not all patients need ventilators anyway and the majority can be managed using non invasive oxygen machines (NIPPY) far more easily and without highly trained staff.
A global pandemic isn't normal circumstances and the nightingale hospital in London is an example of how the beds, equipment and ventilators can be put in place in an emergency.
The NHS is underfunded for sure, and I would happily pay more tax.
People with a learning or physical disability will not be denied treatment as things stand.