Yes, it's only about 5mm thick steel cemented to the underside of the arch. Thanks for the help.
No problem!
I'm not a builder, so not seen this before. But it might be a technique used simply to maintain the shape if it's just cemented on.
Not a builder either, but I'm pretty sure that steel must've been put there before the bricks and cement above it rather than the other way round.
Can't imagine how it could've been constucted without the support from below.
@Ben689908 started
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Yes, it's only about 5mm thick steel cemented to the underside of the arch. Thanks for the help.