Google 'waitrose poynton' and then look on maps and you will see it highlightrd.
Answer is always on the internet!
Yes, the supermarket is easy, the Church Hall, not so much. You can see where the Church is on the map too - I'd guessed the Hall was by the Church but was just making sure
Poynton has a clear crossroads in the town centre (with a distinct cobbled "shared access" road junction). You are 300 metres away from Waitrose at this point. The Church Hall is behind Waitrose.
So don't panic, if you are on a cobbled-ish crossroads, you are almost there.
I'll be at my Father-in-law's from Friday afternoon, in Stockport. I'll try to pop up there (although the Vernon Arms sounds like a horrendous "Chain-pub"). The Robinson's pub opposite Waitrose, The Farmers arms, seems a better bet (I never drank there) and, if it's still a Robinson's Pub, you'll at least be sampling local Beer.