What is the likely hood of being searched whilst crossing borders on a boat from the UK to mainland Europe?

When crossing to mainland Europe from the UK it is normal practice to pass through customs and immigration control points. It is common practice for such agencies to carry out random searches of incoming visitors. You will also find in these areas that sniffer dogs are wandering around that are trained to find drugs and other substances.

The only advice I can give is: If in doubt, DON'T

Would agree with all that Jean-Michel has written. The question is; how are you going to explain why you are carrying plant food. Customs and Excise personnel may be many things, but stupid they are not.

It may,at the moment, be legal, but you would be foolish trying to carry it round Europe.

not sensible. anyplace there are little ones traveling, there are sniffer dogs. The dogs will discover besides the fact that contraband you attempt to usher in, so do the clever element and ignore the full concept. in case you particularly can't deal without your extreme, i'm confident you will discover some fool over there arranged to sell you something.

You only have a 6% chance of being searched. Good luck.

If they are legal you shouldn't worry. Your questions though show that they most likely aren't. I am sure that if you get frisked that the local authorities will not like you carrying legal highs!

To be honest you should not do that. You will be caught. Security in tne UK is strict. Good luck with that. My advice -- go to Amsterdam or Prague and pick up some gear , then take it to your destination...It will work best. Good luck with your adventures.