[Kwiatek]

I find also in original manual (pilot notes) for Spitfire MK V with Merlin 45,46,50,50M

Take off rating - +12 lbs

1hour rating - +9lbs

5 min rating - +16 lbs
----------------- +18lbs - for engines with "M" only

And i didnt saw before these test :

http://www.spitfireperformance.com/aa878.html

So i think now that we really need Spitfire MK V B and C with Merlin 45 +16 lbs !!!
Maby it would be good balance if we have Spitfire MK B with +12lbs and later model VC with +16lbs pefromance. It would be nice to see these birds at the incoming chanel maps!