Any question answered...

FAO: Web Devs

I have been asked to produce a web dashboard for a bespoke IT system, to show summaries in table and graph view etc.

I used to know HTML/CSS/PHP/MySQL (made a website part of my dissertation years ago) and am re-learning at the moment. I think this is out of my depth. Are there any easy solutions/frameworks that exist for this sort of thing or should I kindly tell them this is out of my depth?

Frameworks are two a penny these days. Real question here is how important is the product to the business? If it's mission critical then yeah, they need to know it's not something you are comfortable handling alone. If not, and its a pet project that can be done as and when, then look at it as a skills building exercise.