A little license is required here. I know FlyingIron's Spitfire is a Mk IX today it identifying as aMk IIa.
This particular Mk. IIa Spitfire was donated in January 1941 by the Borough of Lambeth Spitfire Fund. The name Borough of Lambeth was given after the group who had raised funds in 'The Walks Own Spitfire Fund'.
Full history here: https://www.historics.co.uk/buying/auctions/2012-02-18/car/1941-spitfire-2a/
Of all the pictures of NK-K to be found on teh interwebs only ONE is of the real plane. The rest are scale models!