As there is no provisional filing in UK, you have the (nice) option to file a patent and not pay for it. If you do that before 31 March 2021 the cost will be £60, after that date it will be £75 when you decide to pay for the Search £150 and Sustantive examination £100 after the 12 months of the filing date.
When you file (and don't pay) you do not need to ...
I am not familiar with the requirements of UK's IPO when it comes to according a filing date, which is the relevant act for generating a priority right. At the EPO you can follow the same procedure suggested in the documentation you refer to, i.e. file an application but not proceeding further with it, and for according a filing date all you need is:
(a) an ...
The document you link to says the status is "Terminated before grant".
Ipsum - Online Patent Information and Document Inspection Service
New Search View on Espacenet
GB2560881 - Renewable energy wind funnel for powering of automotive
Application Number GB1704048.6
Application Source Form 1 Publication
One thing to remember is that applications get published regardless of whether they get granted or don’t get granted.
Your link didn't work for me but I did go to https://www.ipo.gov.uk/p-find-publication.htm and entered GB2560881 to find the particulars. If you go there you'll find a link to "Letter - Search" where the examiner points out that the ...
As Eric mentioned in a comment, the issue is degree of disclosure. It can be a subtle issue. A publication that explained a result but did not show how to achieve the result would not be novelty breaking.
If you think that might be your situation you can file an application and provide the USPTO with all of the information about the publication. Dates, ...