By the strangest of coincedences, I might be able to help you a bit. I was in plymouth in Feb (for the first time in my life) and was mooching about the town when I came across a tool shop (utterly by accident, Honest!) It's not exactly a woodworkers emporium, more like the now less common hardware shops, but I still ended up walking out of there with tools, even though I was on a freebie magical mystery tour! Now lets see if I can find it again on /googlemaps..
It's in the pedestrian zone on the corner almost opposite the main entrance to the covered plymouth city market, which in turn is very near the Toys'r'us next to the main A374.
If you use a gps tracker on your phone - here's the address
The Tool Shed, 1-5 Frankfort Gate, Plymouth, Devon PL1 1QA.
and if you don't (and just because I'm getting a serious nerdrush that I can even do this....) if you are on the A374 going towards the sea drive past the sainsbury's on your left, round a slow left bend, past Toys r us then filter left and at the next main junction turn left into Union Street, 1st exit on the roundabout (Derry's cross) into Raleigh Street, which turns left into New George Street, then right into Market Avenue in short succession. Take the next left, (pretty much right after the right turn into Market Ave) and you'll see a car park. Park the car, come out the entrance you came in, turn left walk hmm 15 metres and you'll see the covered market on the right, and the tool shop right in front of you.
The internet - bloody brilliant, it's uses like that that helps me forgive - or at least put up with - all the other excrement that's on it too. (and if you do go in, tell them the guy who was on a day trip from Bristol in the big brown hat sent you
)
I can also recommend the fish n chips from "Harbourside" fish n chip shop on The Barbican, on the other side of the harbour where the national aquarium is located. Very tasty.
Harbourside Fish and Chips
35 Southside Street
Plymouth, Devon PL1 2LE