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Double check valve installed wrong! Should be on the cold inlet guys!
Sorry to say but Rouge Traders may like this one!

Doesn't have to be on the cold side, some say cold some heating

I like cold myself as you can drain the heating down easily via the valve
 
The Mi's state the filling loop should from the cold with a check valve to the return pipe with a check valve. This one is connected to the hot pipe minus the check valve and to the flow pipe. The Mi's also stress the gas pipe should a minimum of 22mm from a governed meter to the appliance. It is 15mm on this installation. And yes you can run the condensate to a rain water gutter that was not really the problem. But at has to be to a combined rain/foul drain. And be at least 1/14" external piping and be insulated...And you have to have the permission of the people it belongs to...
 
If a gas safe inspector goes to that, the installer will have to return and correct several installation defects just from what is evident on the photographs.
Condensate pipe is undersized, unsupported and not lagged, termination point is dubious, external flue not sealed, filling loop still connected and apparently to hot not cold, there's also a possibility of the gas supply pipe work being undersized
 
Hi Fiona, has the Gas safe inspector turned up yet & if so what was the outcome? I'm still a bit concerned for you on this one.
 
Eek, should have remembered about bathrooms. Completely forgot about them as I've never installed a boiler in one tbh. Also if I was, I'd be selling them a consumer unit upgrade anyway to avoid cross bonding as it looks ugly 🙂

Going off to flog myself for providing non-trusted advice there..
 

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