OK the tools are in. The plan is to drill two small holes then screw and glue the ramp back together. I made some measurements with the newly acquired caliper which gave the following layout.
Once the required points for drilling had been located on the door and hinge a search of the toolbox returned two screws of about the correct length that wouldn't need to bite into the hinge more than halfway. I would have liked to use countersunk brass screws but they were 'gud enuf' and the tikes' wooden animals would just have to negotiate then as best they could. I used a Dremel with 3mm and 2mm HSS bits to drill through the door and into the hinge respectively. After that it was just a matter of using PVA to form the joint and screwing the pieces back together. Wipe away the excess PVA with a damp cloth and leave to set for 24hrs.
A final file down with a needle file of any edges on the screws sharp enough to catch little fingers and JOB DONE.
