Finally got round to posting these
It was broken in 3 pieces. I first shamphered off the back of the bits then temporally held them together with superglue so that I could apply fibreglass without it moving.
Then a couple of layers of fibreglass
Then I had to fill in the chipped missing parts of the tile face. For this I used the Mrs VAST collection of nail varnish which I mixed to get the best colour match and then used it as a filler by building up layers. Any varnish that went over where it was not wanted was easily removed with nail varnish remover.
Close up if you know where to look you can see it but from a standing position you can not tell. I am very pleased with the result.