A google search reveals quite a lot of sources of information for the Vildebeest Marks III and IV. I have gaps in my knowledge on the Marks I and II as follows:
Mark I
What was the max speed?
What was the range?
Mark II
What was the max speed?
What was the range?
What was the weight empty?
Mark I
What was the max speed?
What was the range?
Mark II
What was the max speed?
What was the range?
What was the weight empty?