Series 9 Episode 7 discussion

[HellsBells]

As much as I hate to say this I don't think there are any twists to Lucas/John storyline. I think it was exactly as shown in the flashbacks with John blowing up the Embassy and killing the real Lucas, probably at Vaughn's suggestion (although I find the plot hard to shallow and unbelievable).
The Albany file is the key, I think to series 9. If this is such a precious file how come MI-5 think it is safe with a retired staff member, surely MI5 don't normally allow staff to take such things home.