It was indeed. Had my first pint in there one lunchtime (Tennants Light 1/10d, as I had double physics straight after lunch). Thereafter, lunchtime pints were in the Park Bar where a maroon blazer under a duffle coat was a common sight.
If you remember Tennants Light at 1/10d, you must be about the same vintage as me. My first regular pub was The Mayfair and I can remember light at 1/9d, heavy at 1/10d but Tennants lager was a staggering 2/3d. The old regulars (ie the over 21's) used to tell us they'd give up drink rather than pay over two bob for a pint. But they didn't.