I'm not sure how much it's likely to affect modifying your bike, but from the anti-tampering proposal document:-
Tackling tampering
We define a system, part or component as:
"software and/or hardware that impacts on:
the environment;
road safety; or
security”
This would include examples such as those which assist or fulfil the driving task,
control power, speed or emissions, protects road users or protects the vehicle from tampering.
You can download a copy from the DfT and take part in the survey to read more and give your views.