Yup Adderstone. What you describe with the BMW is exactly why two bays were free but could not be accessed by Teslas even though you could park up. They need to make charging cables the length of petrol pump hoses if they want to enable vehicles to charge from either side in any parking space. It's a mess.Presumably at Adderstone SC? I was there on Wednesday afternoon and there was a BMW in Bay 1 using the lead for Bay 2 because of the plug location. A dark coloured Tesla came in and I suggested he back up to Bay 1 from the far side to access the plug which he did. It is very handy having access to both sides at this location, I had previously suggested it to a VW driver who could not access the plug from the one remaining slot because of their charge port location.
When I came back to Adderstone again on Thurs night, the HGV's were parked up for the night on the far side - so that option won't work at night!
You're right that at night it becomes nigh impossible to do this because of HGV parking. I was there two nights in a row but thankfully no other non-Teslas were around.