Maxwell & Sons Ltd also had a branch at 927/9 Brighton Road, Purley and there is an image of a 10in. record sleeve with that address on it at this link:
https://www.45spaces.com/record-shop-sleeves/r.php?r=reg597725
I also found this advert in the 'Croydon Times' dated 23rd October 1959:
“SALESLADY with experience required to take charge of gramophone record department — Maxwell & Sons Ltd., 927 Brighton Road, Purley. UPLands 3410.”
https://www.45spaces.com/record-shop-sleeves/r.php?r=reg597725
I also found this advert in the 'Croydon Times' dated 23rd October 1959:
“SALESLADY with experience required to take charge of gramophone record department — Maxwell & Sons Ltd., 927 Brighton Road, Purley. UPLands 3410.”