Yes, it's only old shows (ie pre-mid 70s I think) which have missing episodes. Newer programmes will be kept forever (in theory anyway).
Yes, there will by Christmas specials of My Family, Not Going Out, After You've Gone, The Catherine Tate Show, and probably many more.
And please no more addresses Jamie! If people are interested enough (which, it seems, they are not), then they'll be able to find it out for themselves, if not then you've already posted it about a dozen times at least!
Finally, I have made enquiries to 2 entertain and am awaiting a reply. Please be patient.