While it is quite possible that they occupy number 6, it is a separate building.

https://www.mapillary.com/app/?pKey=1610552996285947&focus=photo&lat=53.34174229000001&lng=-6.252918460000046&z=17

6 is the Georgian red brick house on the left.

7-9 is the glass-fronted modern building.

Their map looks awful :D