The OP got a car that he test drove and deemed it worthy of purchase ,it was driven 40 miles with a working clutch (which is a consumable at the end of the day) at which point it expired.
The main issue ,as I see it, is the fact that the supplying garage did not initiate the warranty that was included in the price which IS unacceptable and they should be taken to task on that without question.
The loose battery , water leak and oil leak are "non arguments" in my book as the battery may just need the clamp refitted as the garage may have had the battery out for charging

, the waterpump is a consumable and may have come to the end of its serviceable life

and was the oil leak caused by the clutch going pop and damaging something

.
There cant be many cars of that vintage that are still water / oil tight.
Just playing the devils advocate here , nothing more - honestly.
Kenny