Hopefully they move the draught Guinness equipment to another location? Having said that the restaurant that was there before them did little real business and moved to the sunny side of the street.
If it is closing, it has suffered the classic dilemma for a bar or restaurant owner. If your premises is up some steps/stairs or across the road from the main flow of punters or somewhere in the back streets or the back of beyond, you will not attract customers in sufficient numbers. No matter how attractive your frontage or how good the food or beer is. In my experience that is an iron law, well with some notable honorable exceptions such as the Mozaic, the Shine, The Royal Oak in Borough, The Mitre in Brighton, The Rising Sun in Epsom and maybe Izelas in Kaya.