Thanks Wishstar .. no haven't tried that one yet but now I've got a positive recommendation that'll be next on our list...

We did find a very good place down in Greenwich but, alas, that is a bit of a hike from where we live in North London.
Have looked at a LOT of online expat shops for Tostitos but no luck so far ... I'll keep trying.
Meanwhile my husband's new addiction for Indian food is growing ... at least we can find that!
By the way, for any lovers of English pubs, there are a couple of very cute ones in Belgravia that we just discovered ... The Grenadier in Wilton Pl and the Nags Head in Kinnemont St (please excuse spelling, was a bit squiffy after a lot of Pimms and cider so didn't take too much notice of street signs) ... I would highly recommend both of these if you happen to have friends visiting from the US who want to go to a traditional English pub.