Escapee, Here's a quick translation from "Jackspeak" to English!

Tiffy...Artificer, engineer.
GCE.....General Certificate of Education(School exams)
Vernon(HMS Vernon)....RN sonar school, and demolition school.
RP......Radar Plotter
GI......Gunnery Instructor(And Drill instructor)
POM.....Petty Officer Missileman(See above!)
Roll on me time..... looking foward to the day you leave the Royal Navy!!

Wassail!! Chris