Vauxhall Astra off side indicator stays on static when engine off & green warn light appears on dash.

Recently i have been experiancing occasionally the indicator light staying on when flicked to the right. This stays on when ignition switched off and key taken out (both the actual indicators back & front plus the arrow indicator on dash).

Then when i restart engine and flick indicator left it produces what i believe to be a green flashing warning light which looks something like a "Tow Bar!" (not very informative as to indicating a problem especially when i dont have a tow bar).

I hope someone can help me out on this as i can normally search net and find an answer but no joy on this...(also dont have a hand book that may shed some light)...

Thanks for your time on looking into this...