Recently had my twin wall flue system designed and supplied by The Stove Fitter's Warehouse. I also ordered an 'Ekol Double Sided Clarity 14 Stove "Double Intruder" Ecodesign Wood Burning Stove' at an amazing price.
The flue system parts including the stove were delivered by the due date. Driver even offered help to store it in the garage.
Found one part was missing, informed The Stove Fitter's Warehouse and it was delivered within 2 days.
Absolutely delighted with service received, speedy delivery and an unbeatable price (having researched with a number of other companies).
Would highly recommend you give them a try, I think you will be amazed.