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Do you have any previous convictions?
They could invite you in for interview.
You might hear nothing. They don't always follow up every instance of possession.
It is impossible to predict the outcome of this particular instance but it is possible that you could receive an invitation to interview, a summons to court or a written warning.
I would have expected them to arrest you immediately if they were going to but it can't be guaranteed.
Can I clarify anything for you?
They could but they won't. It serves no purpose.
It is possible that they could send you a fixed penalty offer in the post.