I tried to change the crank set on a bike brought over to the USA from Europe, assuming all bike chains were the same. The original chainring had 40 teeth and I wanted to try one with 44 teeth. The new chainring had a larger diameter as I expected, but I thought the separation of the teeth at the circumference would be the same. Well, I was wrong. The chain links simply didn't fit the spacing of the teeth on the chainring - after a half dozen teeth the chain was not sitting on teeth at all. Is there a difference between chains in the US and Europe?
tl;dr: no, all chains in common use are the same pitch (the links are 1/2" long). However, there are two widths in common use, and you have the wrong one.
It looks like the Jorvik has derailleur gears, is that right?
If so, it probably takes a 3/32" width chain, but your crankset is the BMX/track standard 1/8".
Because the teeth have a taper, your chain fits some of the way on and then sticks. Because it's sitting too high, the effective pitch of each tooth is greater, so it looks like the chain and ring have different pitches. Actually, the pitch is the same 1/2" in both cases.
If you do have derailleur gears, you can't just get a 1/8" chain to match your crankset, because it won't have the lateral flexibility needed for a 3/32" chain to change cogs. Getting a 3/32" crankset (or a 3/32" chainring for your existing crankset) is the right choice.