M&S has a top-drawer reputation in retailing in the UK. After expanding to Ireland, M&S now has 300 stores in some 40 countries all over the world.
But in my opinion, their reputation is way-overblown, particularly in terms of multichannel integration. The problem is less channel integration than the way M&S is organized as a company, with different "types" of stores (typically based on size and merchandise mix). Although virtually all M&S locations are supermarkets and department stores, some do more of one than the other.
And therein lies the rub. An item purchased in one store "type" cannot be returned at a different store type, and sometimes the "type" is not displayed in the signage.
Resolving this issue should be relatively easy, but M&S can't be bothered. They seem to be doing well enough without making the effort, but as for being a leading multichannel merchant? Not in my book!