Hi Tom,
Thanks for your reply.
I realised that the diagram I uploaded should have been clearer as I realised that it's a combination of both the up and downstairs, which doesn't make it easy to interpret.
I've re-uploaded separate diagrams for both floors, but what you said still applies essentially due to the upstairs offices which are outside the boundaries of the main office and only allow 1 MOE due to lock #4.
The door between the 2 offices at the top of the first floor diagram was planned to be locked (normal mechanical handle) but we're debating keeping it closed but unlocked as another MOE.
I've checked the distance and it's approx. 18m from the inside of the upper office to the front exit, from what I can see this should be fine / up to 25m as the lower landing has low risk of fire starting / spreading ?
Thanks,
Ed