asdf1234
I'll try to satisfy your curiosity.
For the past few days the FBO has received at least three bizjets outside of 18:30 to 06:30 each day and probably others I'm unaware of, plus numerous departures. I think it's safe to say that things will go much the same way as they did in the period June to September last year, with the LTN and STN situations seemingly being very similar this year. So, no the FBO is not closing overnight and the NOTAM didn't say that it was - hence the comments elsewhere that you've noticed. I read the NOTAM as being issued so that Stobart can determine the level of demand each day in order to staff the facility accordingly.