Michael going by the book British Rail Fleet Survey I quote a pictur on page 61 " Class AL5 no E3067, in it's original 'electric blue' livery with white cab roof, pale fawn grey cab window surrounds" So I think the colour is right. I am not sure about the Blue, but as I never see one of these in the flesh so to speak I can't say if it is right or wrong. Still a great model.
John