I have just gone down the same route,
Firstly get the union on board including a disability champion.
Atos is only recomendations you don't have to take IHR, Look around your office to see if there is only indoor work.
Get in touch with DOWP have a medical and try to get the condition put as a diability, I did this 3 yrs back.
All the while deliveries were 4hrs I was ok , but last year manager ranked it up and said I was going slow, so got the union involved with the area disability champion.
Managers are lazy and cannot be bothered to sort out duties for you, I had to set up my own one, though my manager is now trying to twist my atos amendment against me,.
You have to try and be strong and one step ahead of your managers its hard, but I do have the backing of my area reps
Good luck at the end of the day it is what you can reasonably do in your office.
Essex mum
