There are hardly any kebab shops in London.

You're kidding right? https://i.imgur.com/GapKBh1.png And I know from experience living in that area that Google Maps is lacking a great many of the local kebab shops.

I've tried a few of these and they don't do kebabs. I think the word designates different foods to different people.

My understanding is that "Kebab" as such simply means "meat". In continental Europe, "Kebab" is often short for "Döner Kebab" (meat sliced off a central rotating skewer in thin shavings), while in the US, it seems to usually stand for "Shish Kebab", (skewers of meat cubes served on a plate either with or without the skewers).

Thank you very much. From what I'm used to, kebab would be a doner kebab in a wrap/sandwich. There are very few places doing that in London.

https://en.wikipedia.org/wiki/Doner_kebab

There are over 15, according to Foursquare.