Move it up north
Move it to Manchester. Or somewhere outside London.
Yeah it's easier said than done.
1. Land / property is cheaper than London
2. Big northern cities have the right infrastructure
3. It's generally a few degrees cooler (although not an exact science)
People really need to learn a lesson that London is shit and just because you have expensive property / infrastructure there it can still suffer failure. Of course that doesn't mean everything in the north just works - but at least you'll have a few extra quid to spend on some fans!
The report doesn't explain why the cooling systems failed. It's because they didn't have redundant cooling systems. That's really all it can be. In a fucking datacentre, in London, owned by one of the richest companies in the world.