Robin
As a bit of general advice to anyone looking for a jacket I would always say,
DON'T SKIMP!!!!
It's worth spending on a good jacket rather than a "it's really cheap, it'll get me started jacket"
I can't speak for the Hammerli but I suspect it would be ok, Gehmann, Anschutz, Thune all make good quality jackets at around the £150-200 mark that would be a good starter for 10.
It's always worth trying them on and making sure you get the best fit, remember although the sizes should all be the same, individaul makers fit willall be slightly different.
HTH
Alan