is it a requirement ?
BCO didn't mention it but I'm at a point where putting it in now wouldn't cause much disruption where as if I wait till his next visit (he's on 2 weeks hols) it would be way more work.
toilet is 1.7m * 0.9m and approx 5m from a fresh air source, i.e. the exterior door into the basement
I could put a 100mm vent pipe in with electric extraction but is it necessary ? it's not as if the toilet will be used that regularly
thanks LJ