Dont car boot them. If you do you may find you get almost nothing for them.
Depending on what records they are you may find one one its own might be worth hundreds or even thousands.
(Record collectors look for things like the date they were issued, the pressings, the sleeve, the track listing etc etc).
So for example, the first Beatles album came out in various forms when it first came out (Mono, Stereo, various presings). An "ordinariy" one may be only worth a few pounds, a first pressing may be worth hundreds or even thousands.
(this was just an example as your records are pre-Beatles, just trying to show how a certain record can be worth quite a lot, particularly if it is rare).
I would list them on ebay and give as much detail about each record as you can.
If they are rare people will snap your hand off.