Mini
The flight crew won't see the loadplan prior to loading, only the final distribution, which allows them to check it against the loading indicated on the loadsheet.
Aircraft will be planned in accordance (or at least should be) with the company ground handling manual, which will specify a preferred standard loading for every a/c type operated. However, this does get varied from time to time at crew request.
BOAC
As regards Ryanair, standard baggage loading on the 800s is everything in the rear, up to something like 130 pieces of baggage (been a while so I can't remember the exact number) and the remainder in the forward hold.
As far as pax seating, depending on numbers, the first 6 rows and last 6 rows of seats will be unavailable for seating, to allow the aircraft to remain in trim with very light loads. Above a certain threashold, all seats will be available.
They also have the most ridiculously easy loadsheets to complete that I have ever seen in my life.