I drove into a marsh and now can't get out.

Now if I'd have been there instead of being stuck in Yorkshire ...
Seriously tho'.
Use your spare wheel as a base for your high-lift. it sometimes helps if you thread a piece of rope/sling through the spokes to aid recovery if it sinks a bit.
Lift each end and stuff rocks/wood under the wheels to aid traction.
Or:
Lift each end as high as possible and slew the car to the side - hopefully onto better ground.
Done this plenty of times.

Yoyodyne said:

Now if I'd have been there instead of being stuck in Yorkshire ...
Seriously tho'.
Use your spare wheel as a base for your high-lift.
Done this plenty of times.

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That only works if your vehicle has a spare

I think I should probably get one for it.