@Dovefromabove I'm sorry but I dont remember the seeds just that they came from a packet of seeds I bought from chiltern seeds. One of the lottery mixes for indoor plants.
Looks as if it could be anything from their whole seed range of the previous season. Although it's title is greenhouse plants, the description says it includes shrubs and trees so there's not much to go on until they get more mature and develop either a distinctive habit, or flowers.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
one thing of note is it has white sap when I took a discolored leaf off but like @JennyJ said got to wait till grown a bit more for proper ID. Thanks for all the guesses as it helps narrow it down.
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Perhaps it would be worth contacting Chilterns to see if they can give you a clue …
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.