The Pool at Glasgow Argyle Hotel, BW Signature Collection by Best Western
The pool at Hallmark Hotel Glasgow is endorsed by reviewers writing for major publications. Out of 2 professionals tracked on TripExpert, 2 referenced the pool, including Oyster and The Telegraph.
Glasgow Argyle Hotel, BW Signature Collection by Best Western 
Oyster
The Telegraph
Oyster "While rates aren't too much cheaper than some more central
hotels, the on-site health club with a huge indoor pool makes this more than worth a look"
The Telegraph "What it lacks in style is made up for in the well equipped conference facilities and the city’s biggest hotel swimming pool"
