Hello,
Back in 2011 I asked if someone knew about the modified Wellington 423 - the special adapted Mk.III for carrying a 4000 lbs Cookie. I am still interested to know which batches (if any) were modified for this heavy bomb.
So far I have found some Wellington 423's in the serial number ranges
BJ 9xx and DF 6xx range but I am curious to know the exact ranges (and/or other 423 Wimpey's as well).
Any help is much appreciated ! All the best,

Marcel Hogenhuis (Study Group Venlo Airfield in WW-2)
marcelhogenhuis@gmail.com