I'm not sure what size the showers are, they are a few years old so are likely lower than todays 9.5+ KW.
It's going to be let on an HMO basis, 1 bathroom, 1 shower room, 1 kitchen, 1 lounge, 5 bedrooms.
So the 16mm to the meter is ok but I should fit proper connectors and replace the 10mm t+e...