I say no. If they couldn't be bothered to attend to the near 100% illegality for 13 years, why would they act against a tiny minority now?
Pedelecs overall are a tiny issue in the UK, and the illegal use proportion is so vanishingly small, no-one is going to do anything about it.
It's a fantasy to think this has recently reared its head. In the first two years of the forum in 2006 and 2007, 38% of the members rode one very popular 22mph assist model that measured at 1000 watts peak gross. The pedelec world didn't come to an end, instead it moved on and gradually the legal bikes took over the majority position that they've held ever since.
We have over 12,500 members, the vast majority of whom ride legal bikes. Nationally there's probably over 150,000 active e-bikes, almost all of them entirely legal. Illegality has always been a minority enthusiast issue, mainly connected with this forum and Endless Sphere forum.
.
Since you have the numbers to hand, I'm curious to know:
1) How many members of the 12.500 registered would you estimate own and ride an illegal pedelec?
2) Of the 150,000 active e-bikes, you say "most" are legal. What % are not legal?
3) Comparing the market now, to how it was in 2007, how would you say it's changed in terms in sales and brands, particularly over the last 1-2 years?
4) Is it fair to say, high-powered e-bikes are now much much easier to get hold of, and much cheaper, than in 2006-2007? One only has to look at eBay and you can see many sellers of 1000W kits and bikes operating freely in the UK, and these are grey imports from China. A few years ago, that was not something we saw.
Nobody can argue the market has and is changing rapidly. Others have suggested there could be an explosion of e-bike usage in the coming years on the back these changes, Chinese imports emerging in the UK domestic marketplace... so the small % of illegal bikes, could become a much larger % in fairly short period of time from now.
And here lies the problem...
150,000 e-bikes is not a lot of them in a national context. And public knowledge of the legal definition of an e-bike is fairly sketchy and non-existent to anyone outside of this group, if you ask random people in the street (even police officers still astonishingly!), It's this lack of knowledge on the legal side, coupled with lower priced imports and an explosion of sales, and more widespread use of illegal bikes, that poses the risk.