Wookey - No, we were not qualified on all three types. You were on either the T1 and T2 (that is, qualified on both, and alternating according to your roster), or you were licenced on the T3 only.
Having said that, when I left my T1/T2 fleet and converted onto the T3, it was a pretty straightforward conversion.
Regarding flight planning, I think I remember correctly - the T1 fuel planning sheet (can anyone remember what we called it?) was printed on white paper, the T2 was on blue paper, and the T3 on pink. Have I remebered that correctly? Performance data was also on different coloured pages.
My memory is heading 180 Magnetic, I'm afraid.
AD