If it smells of oregano, it is Plectranthus amboinicus, often called 'Mexican mint' and a whole host of other local names. It used to be called Coleus amboinicus:
I think it does smell a bit like Oregano, but it looks much closer to pictures of Ajwain than Plectranthus. I'll have to try and find out who donated it to the allotment plant swap.
Agree with Eustace I've been all over the net and looked in my Asian herb book and both seem to look this one. We're you told what recipes it can be used in as this might help us identify it for you.
Could be Cuban Oregano (Coleus Amboinicus) aka Indian Borage. Essential Oils can be used as an insect repellent too as well as the entire plant for medicines for inflammation, wind and detox. It will flower pale purple.
Mix 2tbsp of white,granulated sugar with 1tbsp of water and place on a spoon for a Bee to reach. Sometimes they're too exhausted to reach back to the hives when it's hot and dry.
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It will flower pale purple.