Long Running Bbc2 Documentary Series?

[SURFSIDE]

Hope someone can help, Thanks:
long running bbc2 documentary series

[factor-fiction]

Hi- you may have more luck in Q&P or Media and TV . (This section is used by those looking for Special Offers.)
Do you have any more information- e.g. letter count?

[FrogNog]

Horizon?

[Jomlett]

Timewatch?

[Prudie]

The Sky at Night? (although that's swapped about the BBC channels)

[askyourgran]

I can only think of Horizon.

[tonyav]

SURFSIDE, is this long running documentary series still running ?.

[Jomlett]

Natural World according to wiki...
http://en.wikipedia.org/wiki/Natural_World_(TV_series)

[factor-fiction]

Is this from What's on TV or something similar where you solve a crossword then rearrange the highlighted letters? if so, how many letters please?

[factor-fiction]

Could be, Jomlett- although the clue doesn't indicate it has to be the longest running

[factor-fiction]

I assume you've got the answer now, Surfside. Which one was it? Thanks