It was a baxi duotec 24 kwh. Outside is ok hes installed a 40mm drain pipe for the condesing pipe and sealed the brickwork around the flue.@adam911 can you show us some more pics of the boiler install? Including the flue outside the property.
Tbh with you it looks like a decent install. Aside from the tf1 issue and the untidy wiring.
Also, not sure with the model you've installed but some boilers require side access. Check the manual but it's probably the case he was allowed to install it so close to the wall