Hi Iain,
Rufforth is normally reasonably large. Well, I suppose it takes a couple of hours to look around properly.
The problem is, in my opinion, it has become a "Sunday Market" type of event with more cheap tool stalls than you would care to imagine. Also, in early February there won't be many non-dealers prepared to stand in the cold for the morning clearing a few bits and pieces from their sheds. There will be plenty of stalls selling toilet rolls, cleaning agents, helmets and motorcycle clothing, again depending on what the weather is like.
The best I would hope for would be 3 or 4 dealers like Kidderminster Motorcycles, Richard Deek Trading, BOM Batteries and a couple of traders selling second hand motorcycle parts so it would depend on what you were looking for!!
What part of Scotland will you be staying at?? If you're not too far north it might be worth a visit just to say you've been.
Beezageezauk.