I'm writing this as a visitor to the U.K. and I had a great experience with the people who work there. It was my first time buying a SIM card and I tried to get help from others in the area who weren't helpful at all - one store just told me to go away when I asked what plan would be best for my time.
The guy who worked here helped me a lot. I had initially bought two 5# cards and he showed me how to enter it into my phone. I didn't know it'd be better to get a plan so I obviously used those cards up in a day and went back, given that he was patient and helpful with me the day before.
When he found out I used up the cards, he helped me pick out the plan I needed for the duration of my stay - that was after he sort of got annoyed with me for not telling him what I was using it for. Still, he took his time and helped me, again, to set it up the plan my phone so that I'd be able to do it on my own next time. All in all, I could tell that he didn't want me to have a bad experience while I was visiting.
I'm not a regular shopper here so I'm not sure how the prices compare to other places, but the store keeper's patience and helpfulness with "yet another dumb tourist" was greatly appreciated - enough for me to write a Yelp review for it. read more