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[Mr Gav]

That only works for a clutch type diff or a viscous diff.  If its a Torsen diff, they require at least token grip on both wheels before the diff will start to limit slip.  ie they are next to useless in very slippery conditions or with one wheel in the air.  My Omega has a Torsen diff as does my MX-5.  I have two other cars with clutch type diffs.

Omegas only came with clutch-type LSD

Any clutch-type diff still has planet gears which will allow a free wheel to spin to some degree.

Just had a look at the Haynes manual and it says there is a ident plate which tells you the final drive ratio and if it`s LSD or not, do the diffs actually have this plate on the underside?

Only two ways to tell for sure :-

1, have a look

2, check for the grip-and-release on very tight turns such as tee-junctions

[2woody]

there's a code on the build plate next to the VIN plate under the bonnet, but I don't know what the code is. There are people on here who can de-code your VIN.

There is also a plastic bung fitted to the fill plug on LSD to remind you to fill with special oil only. But it's only a bung pushed into the hex of the fill plug - I've maybe only ever seen one or two.