...and there's an open door...and a keypad...just like the one upon the gas meter room door...LOL....see previous notes upon 'all of that' and yes, it still won't work - despite apparently tapping in the right code....go figure:

https://www.google.com/maps/place/Palestra+House,+197+Blackfriars+Rd,+London+SE1+8JZ/@51.5027329,-0.1014221,3a,75y,223.15h,66t/data=!3m8!1e1!3m6!1sAF1QipNN07rwcRCHKW6KcJ3lrAkpS-0IawxQ32_CV2IJ!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipNN07rwcRCHKW6KcJ3lrAkpS-0IawxQ32_CV2IJ%3Dw203-h100-k-no-pi0-ya358.3377-ro-0-fo100!7i11000!8i5500!4m5!3m4!1s0x487604a55cefbad9:0x6a7dbaf39b71c12f!8m2!3d51.503908!4d-0.104413