This is of course made by 'Clements', as in Ernie Clements, and not the Italian manufacturer 'Clement'.
Unless the bike has some sentimental value to you, I guess you need to figure out if the frame is any good or not. Many British 'sports' bike of that era had very cheap frames made from 'dead' steel tubes. Compared to the lively and comfortable 531 frame you used to own, you might well find this Clements frame a disappointment. I can't be sure from the photos, but I'd hazard a guess and say it's not a frameset worth restoring, mainly because you can probably find a whole bike of the same standard, in nicer condition for very little money indeed. I don't mean that as an insult, I just don't think it's worth investing time and money in something that can never be special. You could probably pick up a nice old racer with 531 tubing for about £100.
I don't know, it's your choice really. As others have said, you don't need to restore something that's just for turbo training as you'll only use a couple of gears and never touch the brakes etc..
Some of the components are perfectly usable though, e.g. the wheels, brakes (not the levers !), nice early Suntour gears etc.