How can I carry four bikes on a car?

As it says, who else has a family and four bikes to carry? What's the cheapest solution. What's the best compromise between cost and safety? Roof rack or tow bar. Someone else must have had the same dilema. I'd be grateful to hear your experiences.
You've no won the Big Cup since 1902!
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Mount the bikes upside down and head to tail.
4x saddle & bar clamps; 2x cross rails; many toe clip straps; a few bungies.
Only issue we have is we're doing SKY Ride in Manchester this weekend, and will probably have to take two cars to get in the car parks......youngest won't cycle from one of the 'hubs'....
Unfortunately they aren't wide enough to carry the 4 carriers afterall! So back to the drawing board. Either another set of roof bars or the most likely, sell the thule carriers and get 2 rear racks as we don't ride as a family of 4 enough to make a difference anyway tbh.
Btw, this isn't an ad for my thule's but I will get round to selling them at some point I reckon.
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Dogma 2 - ex Team Sky
if you have a people carrier type car - the whole thing can get pretty high - watch out for low trees ! - and getting the bikes up there becomes a 2 person affair.
If your bikes are carbon - some people are wary of clamping the downtube - you can get an a rack which clamps the forks - but thats more cast.
If I could spend my money again I would go the tow bar route.
The least favoured option - has to be the boot mounted racks - your car always get scratched - and the bikes never seem that secure IME
Oh hang on, that's how you get four elephants in a car. Never mind.
Opening the doors and standing on the sills I can load them on my own.
May be more difficult if you don't have rails but I believe it's possible.