Vintage Jennings Univox Synth 1970's

Jennings Univox Synth. Very rare and sought after vintage sound. Looks to be in good condition. Been stored in Attic for around 30 years. Was working when it was put away, but I have plugged it in and there appears to be no power. May need new valves or I may not be setting it up right! Please be aware this may need work. There are not many of these for sale but the ones I have found are priced at between £1500 and £2000, so I think this price is fair, as if it isn't working it would be an easy fix I've been told.