There are a really comprehensive and useful set of resources on the UKHSA website, which you might want to use given the hot weather at the moment.
Here are four resources that you might find useful this summer:
The new weather alert system may be useful keep you updated on what's happening locally. This system takes a risk based approach i.e. looking at both weather and social factors to assess risk. More details here.
There is a set of Government guidance including for vulnerable groups. The guidance is for health and social care professionals but may be relevant to your work.