little britain comic relief dvd?

so im collecting little britain dvds
and i only have a few more to get

but i saw one on ebay called little britain comic relief
but i cant find any videos or torrents of it online (i like to try before i buy normally)

so can anybody tell me what it is? is it worth buying?
is it like episodes (if so howe many?) or is it more like the live dvd?
so far i have bought the first 3 seasons, USA and live and im gonna buy abroad too
i have seen them all including abroad and i love them all