Ah yes, can see it does have some ears, definately an eagle owl! I'm in Southampton too and it was in a woods around here that I saw the one I did too, albeit many years ago. Owls are not the easiest of birds to spot, at least I dont find them easy to find. I have seen a barn owl at dusk whilst walking the itchen way and I've heard plenty of tawny owls. Once they get going they are noisy things!!
Where abouts is your dads workshop?