It looks like you already earn too much to benefit from loan cancellation regardless of which plan you're on, so assuming you continue earning at your current or higher income you'll save a considerable amount of interest paying them off sooner.
Assuming you are currently living modestly enough to save some money each month I would reserve about 6 months of living expenses and put the rest toward wiping out the student loans with the intent of paying the remaining loan balance off quickly thereafter.
Note that if you're already in repayment and make an early payment for less than the total remaining balance, the amount your employer deducts won't change (fewer payments will be made, but still at 9%), so factor that into your planning.