'The London Connection' is enjoyable.
It's nothing fancy and is very silly/dorky/clunky/whatever, but I found it to be a pleasant enough near 90 minutes. Not that they are the same, but it's a Disney film that gave me similar vibes to the studio's other flick 'Midnight Madness'; which was, in fact, released a mere matter of months after this - so that makes sense.
It's a good cast. You have a well executed performance from Jeffrey Byron as lead, while the rest of the onscreen talent - spearheaded by Larry Cedar - are all solid. It's also interesting to see Roy Kinnear and David Battley together as a pairing, given they both appeared (though not next to each other) in 'Willy Wonka & the Chocolate Factory' eight years prior.
Worth a watch, it is. It's paced nicely and has a neat score; even if parts of the latter do feel out of place in parts.