It is my understanding that MPs can often end up working until very late, when trains may have stopped running. Therefore, it is accepted that you can claim for a taxi or a hotel stay. However, Grant can actually enjoy a train service until 0136 (which I believe does stop at Brookmans Park). If Mike should win at the election, I will fully support him on being able to claim for travel out of hours, as MPs don't all work 9-5. In fact, the good ones are the ones who put in those extra hours surely?
I will let Grant come on and answer this in more detail, as I feel that I am now speaking for him and I don't actually know him!
Finally, yes, there are many FCC trains that have first class - but none of the inner-suburban trains do, that's the class 313 trains that go into Moorgate in the week and King's Cross late at night or weekends.
The fast and semi-fast trains don't call at Brookmans Park (or Welham Green), and it's very likely that in the coming years the all-station services will become part of London Overground with a 15-minute service frequency all day - which will be excellent. If Hatfield then became part of an extended Oyster scheme, such as zone 7 or 8 (WGC being zone 9) then you would then have a very easy way for people in London to travel to Hatfield or WGC for shopping, leisure etc. Of course, I'm jumping the gun yet and no official announcements have been made or will be made for a while!
I'm also way off topic, and don't think it's the right time to set up a separate thread on this - so the above is just for information purposes and not for further discussion.