You would have been at the top end of Band C of the old sentencing guidelines (51-60 in a 30) which was 6 points *or* a short ban (7-56 days) and a Band C fine regardless of whether points or a ban.
Band C is now simply 51+ (in a 30 limit) - so again, 6 points *or* a short ban. The fine with a guilty plea would be equivalent to 100% Relevant Weekly Income plus 40% surcharge plus ~£90 prosecution costs.
If you plead guilty and don't request a hearing in response to the SJPN, the SJ will either give you 6 points and fine as above, or if he thinks that a ban ought to be considered he will remit it for a regular court hearing for sentencing.