10/10:
Brent Cross West
Probably the first station since Warrington West I've managed to visit on the day of opening, even if my visit was delayed by nearly 4 hours due to various issues
I hoped to have a dinner with friends at the nearby Chinese restaurant such that I can make use of the new station, but unfortunately no one was able to attend so it didn't happen. Also as today is a Sunday with limited shopping hours so I can't go there for shopping as well, and I did my shopping yesterday at the Decathlon right outside the station, therefore I didn't use the station as a result.
Here are some photos I took yesterday night, just before the opening:

Instead, I logged three stations today as a result of going to an orienteering event:
National Rail
264 Saunderton
265 High Wycombe
266 London Marylebone
London Marylebone was the 16th London Terminal I have visited, out of 18 in total, with the last one more than a year ago. The only two left are London Cannon Street and Old Street. The reason that Marylebone was left so late is that I live in the area of Willesden / Dollis Hill / Cricklewood so whenever I need to travel out by Chiltern I always use Wembley Stadium. Today I also bought a Wembley Stadium - Saunderton ticket as well, but on the return I decided to head into London to do something else temporarily, and needed an extra ticket from Wembley Stadium to Boundary Zone 2.
The ticket office at High Wycombe (as I got a lift from the event centre to there) was not helpful at all. I presented by Saunderton to Wembley Stadium ticket and my Oyster card containing Zone 1-2 Travelcard and tell the staff I wanted to go to Marylebone and needed an extension ticket to bridge the gap. The staff initially told me to get off the train and tap in, I then explained that I didn't want to do that and wanted a ticket from Wembley Stadium to Boundary Zone 2 and the staff refused to do that saying that the system didn't allow her to do so, and could only get me one to Zone 6. I ended up obtaining the ticket I wanted by buying online at c2c and collecting it from the machine, and travelled on a train which ran on the Network Rail track running parallel to my regular commute, speeding through Neasden, Dollis Hill, Willesden Green, Kilburn, West Hampstead and Finchley Road which I had never did before (so another new track ticked off the map)
The remaining two terminals I haven't visited aren't probably going to be visited soon. Cannon Street isn't a convenient interchange as it only connects with the Circle / District and I have in general no reason to visit that area, and if I need to take a Southeastern suburban train I normally board at London Bridge; Old Street is also unlikely to be visited soon especially by National Rail as it isn't a useful interchange and the line is orbital to my home (in contrast to Wembley Stadium - Marylebone which passes through my home non-stop).