Can you "PRS" an advisory?

Had a trade MOT today for a local sales company (I've mentioned before I hate doing their MOT's) They hate advisories and always try pressure me to leave them off. Normally I let the other tester worry about them but he was off today.

So anyway I had a 10 plate s-max that passed on three advisories. Front disks corroded, coolant below minimum and two nails in a tyre. Since it passed there was no chance to rectify those advisories and take them off the pass cert unless another full test is carried out.

The company in question is paying for a new set of disks and pads, a tyre and some coolant to rectify the advisories. The coolant advisory would of been easy to rectify during the MOT if I had thought about it but I went ahead and wrote it on the VSI printout (VT40?). Would I of been ok to top up the coolant and scribble out the advisory, technically doing a PRS on an advisory?