Tilii,
No need to be narrowminded on the Guv.
I believe he was referring to an individual who was upgrading from one type, say an ATR to another type, say an RJ, and moving to the LHS at the same time.
If such a scenairo is possible in Europe, then the pilot wouldn't be typed on the 2nd a/c.
The only reason I bring this up is because in the USA some ALPA contracts actually allow a type change every year, and if a pilot is senior enough to bid the newer a/c, sometimes the airline finds it cheaper to pay him at the higher rate of his bid awarded a/c instead of train him on it.