Mk2.5 Icon has it a LSD?

[Tyre Smoke]

How would I find out, or was it factory fit?

It's a 2005 1.8 Icon if that helps. I think I read somewhere that there was a range of options including heated leather seats ( ours has) a LSD, heated screen, for the Icon as factory order when new.

[Tyre Smoke]

The car seems to have led a fairly unmolested life, it's totally original as far as I can tell.

Giving it beans around a roundabout seems an excellent idea, but I fear it will only induce some rear out action.

This being a 2005 car, it would have the Fuji wotsit LSD if it was fitted wouldn't it? Is that more of a traditional LSD over the Torsen one fitted to earlier cars?