| I think Cadwell is more popular simply because they run the track for something or other pretty much every day, so there's loads of availability.
For people like me, work commitments and shortage of dosh means that I can't plan out a trackday calendar for the year, I'm more likely to go on an ad-hoc basis and therefore more likely to find an event happening at Cadwell than at Oulton at any given time. | 
Jools
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