Hey Lee, great you have an interest in the history.
I raced in London area also,same time period, its possible I raced with your dad, my local track was Hounslow on the high street, started at Hammersmith. Would love to see your dads cars at some point. I still have mine.
I would start by sorting the chassis you have into two groups those with 3/32" (after 1970 ish) axles and those with 1/8" axles (1969 ish). These dates are a broad brush opinion as there are many other details that can date a car. Air control on those bodies is a good clue,
Do any of them have a signature engraved on them ? I see some Steube patrs (2 big holes in drop arm) 1971 RTR chassis on the lower left maybe a later steel chassis you may also have a Lee Gilbert also. you also have two production based frames a Champion and Dynamic group 12 plus that early (68)F1 inline frame.
It would help if you laid the chassis out and numbered{or lettered) them. The mounting pin holes in the side of the bodies should match up to the chassis with the wheels in there respective wheel arches.
I noticed you have 2 Dynamic aero bodies (top left) they maybe a good fit for brass Dynamic group 12 chassis. Although I am more interested in the Pro stuff. The three bodies with air control add on's should fit the four chassis at bottom left.