No, it is a summons. You are not on bail. If you don't attend they will just deal with you in absence although obviously you should plead guilty to avoid costs.
They will just add a further three points to your nominal licence if you are banned already.
but there will be a fine and you obviously want to avoid paying trial costs.
Can I clarify anything for you?
Not if you have pleaded already.
Obviously this does only apply if you are still subject to a ban.
If you have pleaded guilty then they can't award costs against you other than the costs that would have applied if you were there.
If you are banned already then they cannot ban you again.
This is suitable for sentencing in absence.
All the best.