OP, I'd never heard of the dry robe before now, can't see anything wrong with it, if you like it, get it.
I'm also on the lookout for the perfect winter coat, so thanks for all the previous recommendations.
I made a list for myself but thought to list them here if anyone else is looking:
Rainsisters
Craghoppers
Regatta Romine or Freyla
Regatta Eloria
Seasalt Janelle
Mountain warehouse
Didriksons Erika parka
Tesco
North Face down-filled parka
Lands End Squall
Animal
Oodie
Reincoat Pro by Reinwear
Helly Hansen
Arc'teryx
Patagonia
Paramo
Schoffel, Fjallraven
Snuggz Unisex
Red Equipment
Jaeger from M&S
Cotton traders
North Ridge
New Forest Ladies Arctic parka
Willliam Powell
Le Mieux Anya
Sweaty Betty longline parka
Rab Valiance down parka
Roxy
Equidry
Wild & Free
Element Karbon
Bench
Merrel long puffer coat
Columbia
Nexus
Delta Roam
Osprey
Aldi
White Stuff Sloane
Red Adventure
Stable Skin
Trespass
Vinted for cheaper versions