@ Cadet planefag
By '2-planes' we mean planes that show up as 'Military' on ADS-B Exchange that have the reg. Number format 2-ABCD, 2 being the prefix for Guernsey in the same way N is for the US or G is for the UK. Example: I'm tracking 2-MSTG and 2-NYAW now.
Whoever these people are, they are registering them in Guernsey to hide their origin and owners. Guernsey is to the UK like the Caymans is to the US, i.e. well dodgy and to do with lots of money.
As for 'Blocked flights' I usually check ADS-B Exchange, Flightradar and radarbox, as one of them tends to have the info. it's not perfect, but it fills gaps.
Feel free to ask questions if you need more.