This is really damn good gin (The West Winds Sabre). Really nice, aromatic, big juniper, citrus peel, botanical, smooth yet dry drinking with bright flavours. Dolin is classic dry white vermouth, very fruity, but not extremely dry.
The orange bitters are OK, a little less depth than Angostura, but it added a nice dimension.
All combined, for a martini, this would have worked better with a less characterful gin, or a dryer simpler vermouth.