Laura: if you're riding your bike (with off-road switch) through rough housing estates, delivering suspect small packages and collecting wads of £10 or £20 notes, then be worried. The old bill, once they stop you, will probably have a look at your bike, too, and do you for that as well.
Whereas.... the odds on 'normal' riders being stopped and/or having their bikes closely examined is currently close to nil, and with the government's promised 'savings' (read: cuts), are likely to be even closer to nil in the next few years.
A.