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I think a typical D. x grandis would have spotted leaves and stronger line markings on the lip as well as the dot markings seen here. This plant, I agree, is more difficult to place with certainty.
Thanks for the advice - orchids are tricky!
Jonathan, have you heard of the recently set up Glamorgan Botany Group? email me at the museum if you want details firstname.lastname@example.org
Lat/Lng: 51.5456, -3.6184
OS grid ref: SS878842