I've grown to very strongly associate Roger Allam's voice (and especially the style of delivery he uses in Cabin Pressure) with Douglas. I was watching Game of Thrones this evening and hadn't heard that Allam had a role in it, and a role which he performs in a somewhat Douglas-like manner, which lent a sort of... unintentional humor to the whole affair.

...I also cannot help but picture Douglas with this facial hair styling now: