Hi Neil,
The only question you must ask yourself where can you find a road where all the traffic is all travelling in the same direction and the road surface is smooth and free of pot holes.
You will be riding in the main with club members who also value and treasure their Morini's.
The track will be marshalled by Cadwell staff and all riders will receive a briefing and several sighting laps to prepare them for the day.
Yes you can still fall off but then again you can do this going to the shops.
The best advice that I can give you is to stick to your line and concentrate on your own riding and forget about any other bike on track.
It is a technical circuit with sections that have to be ridden with commitment and purpose.
You will not be the only track day virgin, I was one two years ago, so just enjoy the day and ride to your own limits.
Hope to see you there.
Regards
Paul