On Wed, 13 Jan 2010 18:19:40 +0000,
(D.M. Procida) wrote:

I've recently set it up after a year or so packed away for building
work. But I didn't do any adjustments.

I have noticed this glassiness before, but now I want to do something
about it.

Try to pin down whether it IS happening nearer the centre of the disc.
Could be cartridge alignment (don't tell me a Linn owner isn't
equipped to adjust this? :-) Could be worn stylus, worn records.

Have you been listening to a nasty cheap digital system while your
"good" equipment was packed away? Could just be something else....