Probably no need to be worried
Always a good idea to have emergency savings 'for a rainy day' - so put them in an account with a decent rate of interest, in case of a rainy day.
No one needs your consent to prosecute you....the police don't ask people's permission before they arrest them

- but I'm sure you mean 'without your knowledge'.
As mentioned up thread it is very unlikely indeed that you would get prosecuted without your knowledge in this case - if that did happen there is a process for unwinding things with the court and starting again - called a 'Statutory Declaration' - so if you found out later on about a prosecution without knowing about it then head back here ASAP for advice on that to do - IIRC you have to make a Statutory Declaration within 21 days of first becoming aware that you had been convicted by a court without you being aware of it.
The most likely way you could become aware of it would be things like
- a DBS check being run on you eg in relation to a job application and it coming to light
or, and more likely unless you work in an area where DBS checks get made,
- a court bailiff tracking you down a a correct address and writing to you requesting payment of a court fine.
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