Thanks everyone
Can't help but think though that at least early on some defensive/offensive fixed armament might be an idea (like the Shackleton).
You're probably right... I figure this aircraft would be an upgraded version of the original MR to the point where a new name was valid, so a nose turret set-up wouldn't be out of the question in early variations.
I think it is a bit underpowered,since the similar Shakleton had 4 Griffons 1960hp each.
I did have that thought, I dropped the maximum speed slightly to account for extra equipment but I may look into switching the Merlins for Griffons...