I had a listen to some of the stuff on your soundcloud and whilst very competent (and good, really liked a few themes and motif's) it felt rather TV/Film centric which I guess is to be expected. Of course game soundtracks often echo tv/film but there was something about yours that didn't always seem to fit with my expectations of a game soundtrack. Unfortunately I can't quite put my finger on it (maybe individual tracks were too long?), but I did feel that perhaps it would be beneficial for you to familiarise yourself with modern games and their soundtracks in order to write more game centric demo tracks to add to your showcase.
To this end it may well be worth either writing specifically game designed music to sell or even taking on some short, lower paid work for actual game music to broaden your show-reel. For example you could write some themes or several tracks based around a theme and sell them yourself or better through a virtual store like the Unity Asset Store. Indeed hanging out or posting in the Unity forums (and places like Unreal UDK or Crytek) might lead to some lower paid work to get greater recognition. Another positive, is by hanging out in the Unity forums (and other places) you'll absorb the culture for game production and that can only be a good thing in terms of breaking into writing music for games.
In my mind this would kill two birds with one stone, it both expands your showcase with actual game centric tracks and increases your exposure and recognition. Although Unity is clearly aimed at indie's it is increasingly being used by indies making larger projects and the cost/budget of indie company (as opposed to say indie bedroom coders) games is growing substantially. Indeed today indie games can easily have a decent budget for composing bespoke soundtracks, so I don't think its necessary to think about targeting AAA.
You should also consider that for lower paid work that you keep the rights to the music allowing you to sell the soundtrack independently on say iTunes. Several indie games seemed to do this such as Fez, Minecraft etc. It provides a second revenue stream for yourself (possibly making up the difference in excepting lower paid work) and again increasing general exposure.
At this stage I would strongly discourage getting a next gen game console, there simply aren't going to be many titles available for them for the next year or more. Far better to pick up a current gen cheap (360 or ps3) or use you Mac/Pc and join Steam to buy cheap (on sale) games (sometimes you get their soundtracks too), also might be worth checking out Humble Bundle as they often throw in soundtracks with the games.
Overall I feel like discovery and self-promotion are going to be large factors, sure you have soundcloud and a website, but I feel you should be doing more if you want to break into a new market. Get a YouTube channel up (at least a quick search didn't reveal one, though there are several Jamie Salisbury's and a couple of video's using your music), engage as much as possible with fans and commentators, networking is always good and you'll never know when it might give up a profitable lead.
One last comment which is rather critical, is that I didn't feel you had a signature style. I heard echo's of David Arnold/Joel Goldsmith (Stargate) and a few other modern composers in your work. This in itself is no bad thing, and i'm pretty sure producers would often ask for composers to write something in the vein of another, however it did leave me wanting to hear something more personal, more unique, to get a better understanding of you as a person and as a composer.
Anyway with the absent of direct information in this thread (though quite a few good suggestions), perhaps it would be worth discovering some of your favourite composers for games and researching them to see how they got into the business? For example Youtube is a good way of finding the OST's to games to judge the style and maybe get some hints to the composer, from there you can check wikipedia or the composers won websites. It will also point you to game developers that you feel more in tune with in terms of your musical style and who might be worth sending a showreel to.
Lorne Balfe (Assassins Creed 3 OST) (Wiki)
Michiel van den Bos (Overlord 2 OST ) (Wiki)
Magnus Birgersson (Mirror's Edge OST) (Wiki)
Brian D’Oliveira (la hacienda creative) (Papa & Yo OST) (Papa & Yo Wiki)
Rich Vreeland (Fez OST) (Fez Wiki)
It may be worthwhile to subscribe to uk trade magazines (should be free, certainly don't pay for a subscription) so for games Intentmedia (Subscriptions - 01580 883 848) make two that might provide useful information and contacts
Slightly marketing/advertising biased in my opinion, but at least gives you a bit of an inside track on companies making games in the uk.
MCV (The Market for Computer & Video Games)
Focuses on the selling and marketing of games, so not directly related, but might still provide you with ideas, information and contacts.
Now one or maybe both of these also come with a yearly 'Source Book' that lists companies involved with gaming, though much is focused on services that have no relevance to you there is a small section for 'software development' as well as 'Creative & Promotional services' so maybe they might have some useful contacts to pursue.
Anyway good luck with your endeavour.