To be honest, this is 'small fry' and probably needs a thorough check before conclusions can be reached.
My reaction was initially something along the lines of "oh f*** not this sh*** again" until I read more. If something dodgy happend it doesn't seem to have had much/anything to do with Johnson or his campaign, though, yeah, everything must be checked anyway (though I'd hope that most of that's been done already). This looks like a story that wouldn't attract much attention under normal circumstances.
I'm amused to note that Norman Baker has issued a press release
already. I do hope that, one of these days, he's found in bed with a dog.
And obviously no one cases about Scotch-land