So had another look at it. The dimmer is linked to microswitches so when the light button is pressed, part of the hood comes out and activates a switch so the lights turn on. With the dimmer bypassed the leds do now stay on without flashing but they are on constantly. Meant to be getting a comms...
Bought this cooker hood for £20 second hand and the lights have never worked on IT. (Elica cooker hood) There was 4x20w MR11 halogen bulbs on it and a broken transformer for these bulbs which wasn't outputting anything. So we bought leds to replace the halogens. Specs are; MR11 GU4 LED Bulb...