First, though, she needed to crawl out a narrow ladies’ room window and stand up on the sill.

This rigid material must be custom cut and fit tight between the floor joists, subfloor and sill plate.

Exterior and interior halves drape over a sill to leave the window mostly unobscured.

The hearing was told Sir Bobby had lost his balance as he stood up from his chair, striking a window sill and "possibly a radiator".

But this is the first time sill construction has been used in consecutive years.