Please Help!

I'm trying to find a useable headshot of these actors:

Derek Hunt

He is Derek Hunt (II) in IMdb and has sveral TV credits, including Z Cars & Dr Who

David Melbourne

His listings in IMdb also include several TV credits, including Z Cars, Blake's 7 & Dr Who

Since I don't know what they look like, I could actually have good pics of them from screen caps and not know it...

Any help is certantly greatly appreciated and I will share any caps I have if you have specific requests!