I've based my rating roughly on what they contain or if I can remember them purely from the visit. My stars tend to correlate with how long each took to complete. As a reference, I was at Ewelme a good 2.5 to 3 hours while Widford took me about 15 to 30 minutes. I tend to like diversity, so I rate Iffley low. But, hey, even the time of day, the weather, etc. could effect how I feel about a place.
Ratings are a bad idea.
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