You cannot agree to both the statements the UK has 8,000 ventilators and it has 12,000 unless you are able to explain the discrepancy,
According to the Dpt. of Health and Social care the NHS currently possesses 5,000 adult ventilators and 900 child ventilators. Private health care has another 1200. These are figures from early March. A sorce quotes a capacity to build 400/week Hamilton Medical in Switzerland, but many of those will servuce existing contracts.
It is by no means clear where the additional 900/4900 have comefrom. Most military hospitals have closed but may supply a small number, perhaps another small number are stockpiled. With the situation in flux a definitive figure is impossible to derive, it likely changes by the day.
Yet more negativity from the usual.