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Looks enormous, must be well-fed!
Following the above comment - I went back today and measured it. It is about 40cm tall, but I don't know whether this is unusual!
Alan Brampton (Benson)
Books say up to 60 cm, but they rarely get taller than 15 cm in my local nature reserve.
Lat/Lng: 51.6065, -1.1128
OS grid ref: SU615901
Growing in proximity to a Ginkgo biloba