From the previous thread
Shop Girl posted the following:
The pub used in S4 for the Crab. It has a larger open area than they have at The Golden Lion and the staircase is fancier. When you see Louisa walk in the door in E2, there is a sign by the door that says "The Victoria" but searching on that didn't get me anywhere. The pub is also used in E3 when Joe and his brother are in the pub and when Al joins them there. I have looked at a LOT of Cornwall pub interior pictures online but just haven't hit on anything yet.
Isn't that the same pub they used in 'Saving Grace'? That pub and the Victoria sign were in the first Doc Martin movie, too (you can see the sign in the scene where his wife walks in IIRC).
I looked at the locations listed for the filming of "Saving Grace" and it listed Boscastle, St. Tudy and Port Issac (there were no location listings for the Doc Martin movies). In looking for pubs in those areas I found The Wellington Hotel Bar
. There aren't many photos of the place that I could find but if they did a bit of set redressing it might be it. The physical bar looks the same. Couldn't find a shot of the staircase but in looking quality of the woodwork in the bar and the rest of the hotel it would fit right in. The bar is listed as having a "Minstrel's Gallery" so would have to have a staircase to get to it.
I am probably wrong about it but thought I would mention it for your consideration.