I'm sure you can get small packs of high strength cement repair mix. Check out the diy stores.
The problem is making sure it stays stuck to the existing step. You could drill holes into the step, insert plastic plugs, then nail a galv nail into the plug with a bit sticking out. This will give your repair something to hang on to.
cheers for the replies, as i go up the step there is a break on the level where the step meets the first slab so there will probably be a lot of traffic on that bit, will give it a go anyway
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