Hello and welcome, the best way to find out what's in your area is the search button on the top right of here/ local press etc. People don't give info outright: contribution is important.
I'm not from Plymouth myself but I'd go for something easy and simple, a railway tunnel or maybe old coastal defences could be a good start (once it's stopped raining).
Find a friend or trusted acquaintance to go exploring with then create a report:
28DL Report Posting Guide 1.) Getting Started Click on the 'Post Thread' button towards the top right of the window. 2.) Title and Thread Type Give it a title and select the thread type from the drop down menu. You have basic formatting tools at your disposal to align and change fonts...
www.28dayslater.co.uk