I don't think if you are using a word in another language you will have a worst ranking rather than using english words. In Spanish speaking countries it's very often to see domains with english words.

If you are having impressions and not clicks, might be a branding issue and the domain name discourages the people to click. Its title and description are in English, Spanish or Basque? If you are not ranking my questions would be:

• The keywords you are trying to rank are too competitive?
• Are you using the keyword in your page?
• Do you have any link from sites in the UK?
• Do you target your domains to UK in Google Search Console if this domains are gTLD, if not, those domains are co.uk?