Very rare you find anything earlier than Series 6 on Dave so series before that will be a more challenging find unless buying DVD's is an option.
Fun fact: The first episode of Not Going Out aired on the last full day of the 'Rhythm & Movement' idents before being replaced by the 'Circle' idents the following morning.
Arlo Productions and Avalon Television who make Not Going Out for the BBC will have signed a deal with distributors and most likely UKTV have a signed a cheaper limited deal to broadcast repeats.
Can't wait, and rewatching the series on the iPlayer from the beginning is a real treat aswell. They probably should have given it a rerun on BBC1/2 in the run up too - the BBC need to be smarter with repeats rather than just use Mrs Browns Boys and Would I Lie to You as filler all the time.
One thing I noticed in the trailer is that they haven't done much to hide the fact they filmed it during a rare Barry heatwave. Especially the opening scene with blue skies over the 'Essex' house.
James Corden has tweeted this is airing at 8.30pm, which seems a bit early to me. Certainly think if EE is airing at 9.30pm they'd be better the other way round.