The weekly figures for additional all causes deaths over the upper bound of what is to be expected at this time of year is the most interesting, and it has been building up to around double the usual rate through April.
It’s too soon to compare the UK’s coronavirus death toll with other countries
fullfact.org
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Some commentary.
The graph is about two weeks old which is clearly an eternity in pandemics.
Some additional deaths may be a side effect due to people, through inability or fear, not seeing their doctors or attending A&E for other complaints.
On the other hand lockdown may have reduced deaths caused by road traffic accidents and some work accidents, e.g. on building sites etc.
It is certainly possible that a quantity of additional co-morbid deaths in this period may be offset by fewer deaths later in the year, i.e deaths brought forward from next winter or to put it more emotionally denying 'dying' people their last summer.
Your point about supply of PPE to medical staff is very important I agree, but it's not clear that public face covering requirements would necessarily impact that. Manufacture of simple surgical style masks, as worn routinely by dentists or in nail bars etc before the pandemic could be ramped up massively, as achieved by government decree in Taiwan at the beginning of their outbreak such that they can supply everyone. It's simple low tech stuff that can be automated easily. Much easier than other PPE clothing and especially more so than complex medical machinery like ventilators. In any case, home-made or improvised coverings are entirely adequate for 'source control' which is the main objective, to stop droplet and microdroplet propagating and lingering in confined public areas indoors, where distancing is difficult, and may not be adequate to control transmission anyway - see NHK video above.
The latest suggestion on the news today for people to check their own temperature before using public transport ('one of a number of measures being considered') might be a good idea in itself, but is absurd alone as a control measure, as it can't be enforced and is totally ineffective for any infected person who is not showing any symptoms (either yet or ever in some cases, despite being contagious).