As naz_nomad explains so succinctly, you are likely to be disqualified for a minimum of six months.
Assuming you accept the conditional offer of a fixed penalty for each of the recent three offences, the third will not be processed as it takes you to the 12 point limit. Instead you will be summonsed to court with a warning that you face disqualification.
You do not have to attend bit if you do not the case will be heard in your absence. The magistrates may well decide to impose a fine and points equivalent to the fixed penalty (�60 and 3pts) but they will also disqualify you under the �totting up� process.
If you attend you will be offered the opportunity to explain to the court what effect a disqualification will have upon you, and what, if any, �exceptional hardship� you or others may face as a result.
If your argument concerning exceptional hardship is successful the magistrates have the discretion to disqualify you for a lesser period than the mandatory six months, or not at all. Beware, though. The argument is a tough one and the usual effects such as loss of job are not generally considered �exceptional�.