Hello Chris @tiredchrisuk01, Welcome to Connect. I have never done a water only fast for 2 days let alone doing it for 7 days. I have been able to go longer and longer without solid food by starting slow with intermittent fasting. I did find a couple of sites for water fasting retreats in the UK but they were Devon area.

--- Waterfasting: https://waterfasting.uk/
--- Sura Detox: https://www.suradetox.co.uk/the-venue

I'm a little short on willpower sometimes too. Here are some tips that might help with improving your willpower.
--- 10 tips to boost your willpower: https://www.bhf.org.uk/informationsupport/heart-matters-magazine/wellbeing/willpower-top-10-tips

One thing that helped me when I first started intermittent fasting was to do the 16 hour fasting with 8 hour eating window until I was able to do the 18 hour/6 hour plan. Then when that became easier I worked on the 20 hour fasting with 4 hour eating window until I could do it up to a week at a time.

Do you have any friends or family close by that can help you or can you try to gradually do the water fasting yourself and build up to seven days?