What has been issued is a bench warrant by a Magistrates Court as you failed to attend court on the given date.
Telephone the court and advise them you did not receive the summons and why. They will give you a date to attend when you can appear and enter your plea of not guilty.
No, this is relatively small beer if you do nothing about it and get pulled over in the UK you would be arrested as it will show up on the computer.
You are welcome
A caution is appropriate where a person is technically guilty of the offence but morally not blameworthy. If you did not commit the offence at all then you do not have a plea in mitigation as they put it. A plea in mitigation are factors that explain and lesson the effect of the offence where it is accepted that an offence has been committed.
So again if you did not do it is not a plea in mitigation but a defence.
A caution is a telling off but it stays on the record
You need to make it clear that you will only agree to the caution if that is an end of the matter in respect of this incident and that there will be no further charges based on a variation of the theme.
A caution does not involve a fine
No, a caution takes place outside the court process , usually at the police station