Hang around for a while in this forum and you might see posts claiming that so called 'battery fires' are not a problem at all, very rare even, so forget about them.
Fat tyre conversions have been available for a Brompton for a while. For instance;
https://www.kinetics-online.co.uk/folding-bikes/brompton/the-mtbrompton/
But now we have the G-Line which is all complete for around the same price.
People do fit fatter tyres on the 16" Brompton.
But you need to change the forks, rear triangle and mudguards, and maybe the brakes, because of clearance issues.
The new G-Line, has 20" x 2" tyres, but the frame is designed for them.
I did a similar conversion on a Brompton, I wanted the battery on the front bag block so the battery could stay in place when the bike was folded. The L shaped bracket takes most of the weigh, so the bag just needs to support the controller.
Private e-scooters are illegal in a lot of places, but little seems to be done to stop them being used.
So if a 'license' is required how likely is it that its enforced ?
Indeed.
But in retrospect, I was forgetting how readily some are prepared to lie to the Police etc, as in;
Policeman: "did you deliberately set the cut off speed above the legal limit ?"
Deceitful cyclist: "No officer, it must have been an imperfection on my part"
Whilst the 'guidelines' are that you wont be prosecuted unless you exceed the legal limit +10%, I doubt they are saying that you can never be prosecuted for exceeding the legal limit.
Say you have an accident and the Police actually check your bike and see that you have set the cutoff to...
Well for road legal UK use, the motor should stop giving assistance once you exceed 25kmph.
So if your looking for a eBike that 'I can pedal quickly (>25 km/h)' then most all of them will do that if you put in the effort when the motor stops providing assistance.
Lots of cycle mudguards have a protector covering the front edge of the mudguard.
Even the plastic ones on my eMountainBike has them, maybe not so important for plastic mudguards but a definite safety feature for metal mudguards.
I beleive the policy for electric bikes is the same as it is for vehicles;
https://www.rac.co.uk/drive/advice/legal/speeding-fines/#am-i-allowed-a-10-leeway-of-the-speed-limit
Unfortunately the (probably) illegal use of eBikes by Delivery riders is very visible to the public.
Every time I go out on my bike I will see plenty of Delivery riders, no pedaling and throttle only and going way faster than 15.5mph. And self converted bikes apparently held together by gaffa...