I ordered the Lavenham on Monday and it just arrived on my doorstep in Canada. Very fast.
As I said I'm a 36S so the size Small fits more like the Barbour Liddesdale in Gerry's post—a bit looser, although my arms are shorter so I may turn the cuff back. I can comfortably wear it over a blazer, but the shaping means it doesn't look enormously oversized on its own. I'd agree that a small in Lavenham is about an XS in an equivalent Barbour.
On that note, Winners (AKA...
What do you mean the trim was "restarted"? From your pictures it appears that when adding the trim the maker started sewing on the back, continued up the sides, around the front of the bag, and ended where they started, with a bit of overlap. A piece of trim has a beginning and end. Did you expect it to be seamless?
Many threads on this recently. Do a search. Also check out Charles Tyrwhitt.
The Bow Tie should be the same material as your jacket's lapels (i.e. Satin or Grosgrain). The vest may not feature any silk, but if it does then it should also match. For example, the one you linked has satin lapels.