Spiderman and Superman abseil into the Evelina Hospital

The grime fighters – better known as Paul and Nick from All Clean, the window cleaning contractors for Guy's and St Thomas' – abseiled from the top of the building to clean the windows of the wards that look out onto the hospital's atrium.

"It was a real treat for the children to see the superheroes at the hospital and they all ran to the windows when they saw them descending from the roof," says ward sister Shelia Campion.

"We are so grateful to the guys at All Clean for being such good sports."