Stores with good after sales

[Gunboat Diplomat]

Most retailers are pretty reliable at getting a box delivered these days, but after some pretty shaky after sales support on a recent order where the wrong item was shipped, I'm on the hunt for somewhere new to shop.

 

Any recommendations for stores that actually have well organised and prompt after sales support?  Preferably with a good focus on GBBRs as that is the bulk of my spending these days!