Which bit is loose? The whole tap into the sinktop or the spout into the body?
For tap into sinktop you will need to get underneath with a long tubular box spanner of the right size and tighten the nut. BE VERY CAREFUL OF THE FLEX HOSES.
https://community.screwfix.com/threads/loose-wobbly-kitchen-tap.197401/
https://m.youtube.com/watch?v=Q_GSxlf5vh0
Loads more out there to find with a quick search
For spout to body there are several options depending on the way the tap is put together. Search for loose mixer spout
Ffhu, October 2022
