how to register software patent in UK?

A patent application can be filed at the UK patent office. If the invention meets the relevant requirements, including novelty and inventiveness, and if the invention is not excluded as being a “computer program as such”, then it should be granted, giving you patent protection in the UK. You can also obtain protection in the UK by way of a European patent.

I suggest you get in touch with a patent attorney who will be able to advise you whether your invention is patentable in the UK, and who will be able to draft an application for you and represent you before the UK Patent Office.

Hope that helps.

Software patents are dirty scum.