There used to be one like that on Uxbridge Road in Hillingdon, I think it was called Bartletts. It was a double fronted shop, half of it was for walking and camping, the other half was for caravanning and motor homes, while somewhere they crammed in a bit for canoeing. The place was an absolute treasure trove of different brands and bits and pieces that you would never find the likes of in places like Blacks and Cotswold. It wasn't in a major shopping area, just a couple of local parades, the last place you would expect to find such a shop, and it was a bit out of the way for me to get to, but it was always my first choice. Sadly it's long gone.