Personally I think this particular attempt at legal action will come to nothing. If such action was going to be taken, it needed to be done immediately.
I seriously doubt the CPS will pursue it.
The chances of it being successful are small. The public interest thing isn't there imo.
If there had been a lot more evidence of 'leavers remorse' then there might have been a case. In the absence of that, its very difficult to prove very much at all, even though people have admitted to lying.
I am someone has for a number of years had a real problem with election leaflets and lies, so I would like to see action taken in this area, but after the fact in this particular case, I don't think its going anywhere at all.