I've had that problem a couple of times both in Ireland and over here in England too. I think that every staff member who has to deal with customers should have at least basic english.
It happenend to me in a supermaket in London recently. I went around the shop asking nearly every staff member where a product was and eventually got the manager who turned out to be the only english speaking person in the store, bar the cashiers. I told him that id had difficulty with his staff and he just told me that they were the only staff he could get so I think thats what it comes down to. Employers are just desperate for staff now and will hire anyone that can do the job regardless of their race and language.
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