In message , john
west++++ writes
Hi, we have a large patch of moss at the moment showing bright green even
though it is winter.
on the packet of 'Evergreen' it says to use between april to september.
is it worth trying to use evergreen at this time of year on the moss please?

Not really. You can't make the grass regrow until it gets warmer.

Or any other suggestions?

Improve the drainage and adjust the pH with lime. Your problem is pretty
fundamental - on waterlogged soil in winter conditions moss wins.

You could alternatively learn to love moss. Moss gardens are popular in
Japan.

Regards,
--
Martin Brown