We live in country with plenty of rich people and probably far more who are really struggling financially. Yet looking at the economy, we are not in a robust position, so arguably are not a rich country, just a country with a lot of rich people.
Sadly, the Citizen's Advice network is a collection of charities that are reliant on donations and bidding for funding for projects etc. so are also not in a robust, resilient position.
Add in the increasing reliance on food banks, also charities, and the view that we are a rich country becomes harder to maintain. Rich by which measure? Overall GDP or GDP per capita masks the millions who are struggling.