Hi Wade
I live in Denmark, and i can only say, that its not a good idea to carry a knife in public.
I know that the legislation in England is a bit tougher than i Denmark.
Have a look here:
https://www.gov.uk/buying-carrying-knives
If its a short blade 3" or less you can carry it if it doesn't lock. But you still could get in to troublem
In Denmark we have areas with zero tolerance for any weapons, and you could get arrested carrying a tooth pick here.
I'm not sure about Germany.
Have a safe trip :-)