LOL, the Pursuit Ship is a nice design for being a really cheap and basic design. The BBC effects output was a bit of a joke back then, with the department given next to no money and even less time to do things. Some of their work on Blake's Seven was miraculously good under those conditions, but most of it was inevitably dog rough.
Like the original Star Trek though, the show often made up for lack of visuals by using script and editing to build up tension.
One bizarre aspect of the design is that the wing and fin tip weapons and equipment point outwards from the centre line of the ship. This means that the ship will have to point away from a target it wants to shoot with the secondary armament, and those weapons can never be simultaneously brought to bear on one target!
The main plasma bolt launcher that takes up the conical front of the craft used to fire a sinister enough looking ball of death, but it took so long to reach the target that I could never understand why somebody didn't suggest moving out of the way.
I've often fancied doing an updated version. Maybe now's the time.
