How can you bring the government down, OP?
They are a democratically elected party with a large majority. They only way they would fail is if enough Tory MP’s left the party to become, most likely, independent MP’s, and the government couldn’t govern and would call a GE.
This isn’t going to happen. The Tory ship isn’t sinking so the rats are staying put.
If there are legal issues surrounding certain people’s responsibilities and their abject failure to ensure the safety of the population, that could be challenged in a criminal case, is totally different and there are enough other Tory MP’s who could hold a majority.
The Queen won’t call for a GE because it would be totally outside her constitutional remit.
Other than revolution, I can’t see how the government could fall.