[chiph]

There are CV writing/review services available, but I can't recommend one that specializes in technical jobs. Perhaps someone else here can.

Because it sounds like there's something about your CV that is causing it to be ignored. UK standards for this are different, but make sure you don't include things like age, gender, race, or a photo. Do make sure there is correct spelling and grammar. Focus on how you used technology to solve business problems.

The other possibility is that you've hit an industry-wide hiring lull. It's getting towards the end of the year (budget time), and the economy is slowing down.