Hey Bernie, can you take a photo of the damage if you can.
Would be good if you can show some sort of reference for me to compare hole size-maybe a ruler (no NOT your Missus !) or a tape measure near the puncture.
If the screw went in vertically it should be pretty straight forward, depending on the size of the hole. If however, it went in at an angle, it could be a real issue.
FYI for everyone, 2 repairs in the one tyre is the max. allowable under law, and the only legal repair is to use a Kombi/Combi plug, and the tyre MUST be removed from the rim. Bead sleeves and internal patches are verboten as well.
CORD plugs have been banned from use for over 15 years, and I don't understand how they are still allowed to be sold, but that's another story best left.
Some people ***** and moan about all the above, but I value my life, wife, rugrats and car more than them