Tobacco in hand luggage?

I'm going to Czech tomorrow and would like to bring back some tobacco, preferably 250g.
Problem is, we're departing from a small airport when we fly back to London and they don't have cigarettes/tobacco in their shops.
Can I buy the tobacco in town and put it in my hand luggage as that's all I'm taking

Will I be stopped at security for having it?

No one cares WHERE you buy the tobacco, and the security people don't care about tobacco.

At UK customs, you will have to declare it, and, if you are bringing in more than your allowance (I do not know what that is), you will pay some duty for the amount in excess.

Yes, you will be stopped. It is a contraband.

No.
You are allowed 1Kg from wiithin an EI member state currently.

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