Help identifiying this caterpillar please

Help identifiying this caterpillar please

Observation - Help identifiying this caterpillar please - UK and Ireland. Description: This caterpillar was discovered in our garden after pulling up some ivy. We've had it in a pot (with some ivy leaves & lettuce) for a couple of days for the kids to take to school, but we've no idea what sort of butterfly / moth it's likely to turn into.

This caterpillar was discovered in our garden after pulling up some ivy. We've had it in a pot (with some ivy leaves & lettuce) for a couple of days for the kids to take to school, but we've no idea what sort of butterfly / moth it's likely to turn into. Help please