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The last pic looks t me like it could be Tubby Merlin. Mandarin is an elwesii, and the pic shows what look like nivalis X plicatus leaves. The ovary shape and colour are like Tubby Merlin and the inner mark, what you can see of it, a solid green, could be right for Tubby Merlin too. I know they have a lot of Tubby Merlin at Colesbourne. Was it quite short?