Manhole Cover 18"x24" / 46x63cm (Sherwood NG5)

Hi would anyone have a spare Manhole /Drain Cover please.
Rectangular 18x24 inch /46x63cm which is a standard size for rectangular manhole covers.
The one in the pictures is located at the bottom of the steps leading to my friends front door, her and her daughter have to cross it daily.
As seen, it has a big hole and a crack all the way through. It's very loose and Quite dangerous. Looks like someone could go through if stepped on the wrong bit. Trying to find a replacement for them before someone has an accident.
Currently it's a cast iron cover, but any material type would be appreciated.
Thanks In Advance