As with most things military, there is a lot more support in the US. There is the @vetswhocode group on Twitter which is a charity set up to get vets back into work. America in general does this a lot better than we do!
There are bodies in the UK who are providing more support for example https://techvets.co/ and many of the large financial institutions in London have veterans programs these days, but we've got a long way to go in comparison!