Last summer my cousin happened to pick the venue from HLV as her reception location. I about died of excitement (obviously). It was an absolutely lovely wedding and I realized after all this time I never shared the pictures, so I figured, better late than never!
The hall had obviously been painted for Sherlock or repainted after, as the walls were all white. It was a modestly sized venue but for a smaller wedding it was quite comfortable. The area where John and Sherlock (etc.) were seated in the episode (and where Sherlock gave his speech) was where dancing was set up for my cousin's wedding. You know I'm a sadist and requested "December, 1963" before the night was over ;) The opposite side of the room had a permanent looking bar. The windows let in beautiful light and the gardens outside were exquisite (and included an underground grotto with a waterfall, where many of us sought reprieve from the heat). The scenes elsewhere (the church, the scene with Sherlock showing off his dance moves, outside Sholto's room, confronting the photographer, etc.) were not filmed here. Happy to answer any questions, I know I've been AWOL from Tumblr for ages but I'll check back in now and then to just spam everyone's timelines with Johnlock and get back in my feels about it all. It was a fantastic experience, and we also spent a few days in London and visited the London Aquarium where the infamous odd Mary death scene was filmed, and stopped by Gower St. and Speedy's obviously. I am happy to post on those too if anyone is interested :)