66+ in a 40 is band C - 150% Relevant Weekly Income (100% RWI with discount for early guilty plea), 7 - 56 day ban or 6 points and ~£90 prosecution costs.
If the SJ thinks that a ban should be considered, he will refer the case for a hearing - so if you opt to be dealt with under the SJP he will either gibe you 6 points (and fine and costs), or you will be going to court anyway.