You just need some dowel, MT. Probably 10mm...........
http://www.screwfix.com/p/precision-multi-grooved-dowel-pins-10-x-40mm-pack-of-100/80395
Drill directly into the existing messed-up holes. Glue the dowel into the hole with polyurethane glue, or Super-Glue. Leave some sticking out, then cut it back after the glue has gone off.
Mark where the hinge carrier is meant to be, and drill a new 5mm hole to take the screws.
If you've really made a mess of the holes, then just use a fatter dowel.