about that Maplin regulated supply - got a link? Have searched maplin on 'DC-DC' and '12v regulated' with no success. I've been trying to find 12v DC-DC that will handle the 3A load of an LCD panel but they all seem a bit small so I'm interested in what people have found.
my mistake, they have a 1.5 amp one, but that isnt enough. You can get 15 volts at 6 amps, but not 12. Not enough of an electrician to provide a circuit , but should be possible to provide something to do this. probably diode based. maybe T25 can advise.