Some of the nootropics are Prescription Only Medications.
Being arrested for possession would have some negative consequences for OP. Accepting a caution would be worse.
So, if OP does want to try this be careful about the legal status and if the police do call be polite but say, firmly and clearly, that you'll answer their questions after you've spoken to a lawyer, and refuse to say anything else.
I've never used aniracetam and can't advocate one way or the other, but it looks like aniracetam is OTC in the UK (where it sounds like OP lives) and freely available from amazon.co.uk.
Being arrested for possession would have some negative consequences for OP. Accepting a caution would be worse.
So, if OP does want to try this be careful about the legal status and if the police do call be polite but say, firmly and clearly, that you'll answer their questions after you've spoken to a lawyer, and refuse to say anything else.