According to this website http://www.blackburn-buccaneer.co.uk/Buccaneer_Index.html? , XK486 to 491 were the 6 prototypes and XK523 to 536 were the 14 pre-production aircaft. The first full production aircraft was serialled XN922.

Hope this helps,

FC

He’s absolutely spot on you know.XK532 is the 9th pre-prod batch aircraft.

What a beauty,a genuine wire twanging Bucc.

Miggers:D