While searching the Euro Car Parts site for a N75, this thing came up :-

http://www.eurocarparts.com/ecp/c/Skoda_Octavia_1.8_2002/p/car-parts/engine-parts/fuel-and-engine-management/engine-management-switches/?424440390&1&a40a87a64e962655d5ff1b7d63b48f05a292c655&000554

Is this an N75 of sorts?

It looks nothing like my N75, but the Euro Car Parts website claims it's for a Mk1 Octavia VRS.

Cheers.

Ahhh.... think I might have answered my own question ..... is it a N249 valve?

I dont think so. It may be as you say "of sorts" but I dont recognise it.

Isn't that the N112?

Quite possibly.

My car had had N112 and N249 bypass done before I bought it, so not not seen those two valves before.

Looks like my N249.....

I went to skoda today and picked up a genuine one for £47. Waiting for it to turn up.