Effective April 6, 2018 the UK has made small increases to most of its fees. In addition, excess claims and page fees are being introduced. It will however still be possible to file a UK patent application without any fees. Thus a priority date can be established without incurring patent office fees.
Search and Examination of UK Applications: It is necessary to pay an application and search fee. Both of these fees will increase slightly after April 6, 2018, and the application fee will incur a small surcharge if you choose to pay this after filing the application. A more significant change is the introduction of excess claims fees of £20 for each claim over 25.
The examination fee will also increase slightly. In addition, excess page fees of £ 10 for each page over 35 will apply.
The increased application, search, and examination fees, and the new excess claims and page fees will apply to International applications entering the UK national phase.