Booked a table here for last night, upon arrival w...

Booked a table here for last night, upon arrival we were left standing in what felt like a dingy corridor for a good couple of minutes before being greeted by a member of staff. We were told they fully booked (restaurant was less than half full). I stated we booked then there seemed to be a disagreement in front if us between two members of staff as to whether we could actually be sat down. Once they decided we could, we were given menus and then just left. We waited and waited, tried to flag down some staff to no avail. After 25 minutes of not even being asked for drinks orders, we stood up and left. Extremely dissapointed, the worst service I have ever recieved, in or out of London.