It is illegal to have a baby seat on a rear facing or sideways car seat. they have to be on a forward facing seat. That is whay they are not fitted with anchor points unless they are configured to all face forwards. When all of your kidlets are out of baby seats it should be great but not so easy with babies.

If you are looking for a 4 wheel drive there are some 11 seaters with forward facing seats but they are rare and will take a bit of work to find them. It will be almost impossible to get one second hand (sorry, speaking from experience).