Spitfire IIa P7918

I’m looking for information on this aircraft. This is what I have:
P7918 built at Castle Bromwich. Named NORTHAMPTON and bearing the Borough coat of arms, it was delivered to No 54 Squadron (KL) at Hornchurch, Essex on 24-02-41. Its first confirmed kill was a Bf109 on 11-05-41. On 26-05-41 it went into storage before undertaking a training role with No 412 (Canadian) Squadron (VZ) and then, on 21-10-41 to No 310 (Czech) Squadron (NN). On 19-12-41 to No 416 (Canadian) Squadron (DN) before a major overhaul was undertaken on 18-03-42. Following an-other period of storage, it was issued on 29-01-43 to No 277 Squadron (BA), a specialist Air Sea Rescue unit. On 01-02-43 it was moved to No 57 OTU where another Spitfire collided with it on 19-02-43 making further repair work necessary. Another period of storage followed before it was issued to No 52 OTU at Aston Down, Gloucestershire, on 27-05-43. On 04-07-43 it was involved in a mid-air collision with Mustang AG489 near Brinscombe, Somerset. Both pilots were killed and the aircraft was destroyed by fire.

I’m looking for an aircraft letter to go with one of the squadron codes and the scheme she was wearing at the time, if anyone can help.