Recently Kingdom of Saudi Arabia have tried to make things easier for traveler's especially from certain countries and thankfully UK is one of them. You can apply for tourism visa which is valid for Umrah too, which is nice. Visa can be applied through the official visa site https://visa.visitsaudi.com/ I applied an e-visa. We were a family of 4 so I created a group with our last name, the only information needed was name, date of birth, address, passport details and what type of visa was required we selected 'Umrah' you can choose tourism and business as well. You need to choose an address where you will stay, this can be your Hotel too - thats what we used. The only tricky part was getting the photographs ready to upload for the application, the photos needed to have a white background and max 200px x 200px there are instructions on the visa site - I suggest you create an account first and download the details of pic requirements for offline reading. There are many webs