At first I thought my handy work was in question, its been installed for about 3 months and has been running fine, but recently i've noticed the lights not zooming up and down the display but instead displaying nothing.

Anyway, today I checked it out with meter in hand and found that it was all still connected fine, so i stuck the meter straight on to the lambda wire near the ECU and it read 0.25v constantly no matter where the throttle position was, admittedly this was whilst parked up but I think my Lambda Sensor is up the creek and i've been driving the car like a nutter for the past month like it.

Does 0.25v suggest its screwed?

Hope not, I only had it replaced a short while ago, I take it this is totally not MAF related, I had that replaced 6 months ago too!

Help!

The exact same happened to mine. I was getting a reading of 0.2-0.3v when driving about. It should be reading around 0.8-0.9v when flooring it. WOT.
B.Rawle fitted a new one after a mapping session and all was well again.

yeah, seems like its new lambda sensor time, just concerned that it should need replacing so quickly!

Should be free replacement from ScoobySport, would imagine this stuff is warrantied for a year against malfunction