Glad you managed to beat it mate.
The new Airfix Spitfire Mk1 will look light-years' ahead, compared to their older kits. When they first issued the MkV, back in around 1979, it was streets ahead, and the first, and only kit at the time, to capture the 'gull wing' underside wing root shape. I guess trying to add new parts, from a different manufacturing source, hasn't worked out too well !