Cheers everyone for your help,
This job will require cleaning on a Saturday/Sunday morning so as to minimise disruption.
I too was thinking of wfp the insides, since it’s only a car park stairwell it should be fine.
Anyway I haven’t actually seen the job in person yet so as soon as the Mrs Gets home we are jumping in the car and going and have a look.
One more thing this job is 29miles away from where I live!!
Will take some pics and post them later on.
Cheers
Stuart