Amateur competition car help

[R182S]

Long time lurker etc but did have account on here before but no longer remember my old username or email address for it.

Anyway, for a while now I've wanted to compete in entry level motorsport (I've dabbled before but only in other peoples cars), but I'm struggling to choose a suitable car to buy.
Now because of where I live there's not all that many events in a reasonable distance, so I want a car that I can use in different event types such as hill climb and auto tests/auto solos, and anything else I can get into.

Criteria:
Sub £700. Im on a very tight budget and need to be aware of running costs so cheaper the better as the upgrades to make it competitive will follow.
Relatively small. So it can be chucked about and competitive in auto tests.
RWD. Just because.

MX-5 seems obvious, but I don't want one. :-)

If you'd know of anything that would prevent me from competing in different competitions please speak up, I'd really appreciate it and any vehicle suggestions.

Thanks

[R182S]

Thanks guys but because I want to do auto tests I want it to be RWD (more fun in the fields/on gravel), but also I've already got a 182 as a daily and no doubt a 172/182 would be great, I needs to be different to what I drive every day and again RWD.

Do you see any problems or conflict in the regs between auto tests and hillc climbs or sprints? Don't want to miss anything.

Thanks

[R182S]

Thanks for the great advice and link.

It might be worth me mentioning that I've competed in autotests/autosolos before, and came 2nd in my second ever event in someone else's car (E36 compact with LSD).

I'm sure an MX-5 is a good option, but it just doesn't do it for me, but maybe I'll come round to it. E36 compact is probably top of the list at the moment.

I'll be having a more in-depth look at the blue book and the entry lists for ideas.

Thanks again guys, you've all been really helpful so far.