Neil,
As i said, there are two blocks that are attached to the car which the
bumper just slides onto. These are on the sides of the car just in front
of the wheel arch and are the primary support. DON'T loosen any of the
screws on these blocks or you'll rip them them off the car as you pull the
bumper off.
If you can, remove the screws around the front of the wheel arch casing
that are attached to the edge of the bumper. If not, I suspect the wheel
arch will break before the bumper does but keep an eye on these bits as
you slide the bumper out. Might be handy to take a tough stanley knife
with you to the scrapyard.
Unfortunately, there should be three vertical screws to hold the
centre-bottom of the bumper in place. These are evenly spaced (8 inches or
so apart) and are only accessible from underneath the car. Mine are
missing, but they look like they should be self tappers and only seem to
be used to stop the bumper flapping about. With a firm enough tug, you
could probably wrench them out of place. As my car proves, it's not
essential to have them so if you damage all/some of the tabs, I suspect it
wouldn't matter. Alternatively, you could easily come up with another
method of re-attaching the bumper here.
There are several interlocking plastic tabs around the front of the bumper
that keep it in place. Even if you could get underneath the car, you're
unlikely to find them all and would struggle to free them without cracking
the plastic. Don't worry too much about these.
The bumper is designed to be slid off forwards, so do as much of the above
as possible before pulling. It's easiest to have two people, one on each
side, to make sure that it comes off straight and level. It will take some
considerable force to remove it, and it won't come quickly. The main
resistance will be the innocent-looking screws on the plastic wheel arch
casing that I mentioned in para 2.
Good luck! Let us know how you get on.
Richard