Well now my gabber is well and truly flasted... Having poked and prodded all weekend, not finding anything wrong with voltages, towing plugs, etc. I eventually gave up and took it to my local - and trusted - independent garage as I was out of time. Had a call from them 10 minutes later saying it was all fixed - they'd just changed both bulbs!!! I KNOW I checked the bulbs first-off, they were fine. I'm at a loss... I'm also mortally embarrassed, but they were good humoured enough when I picked it up! Still at least it's fixed and they didn't charge me anything. For anyone in the Ipswich area, I highly recommend Auto-Fit, just off Woodbridge road - top bunch of guys! ATB