thedad - I have responded to you on another thread too.
Just to reassure others - there are lots of free resources online, on here or through libraries. Please do not feel mocks are essential - yes, if your child is very nervous, it might help them to go through the physicality of sitting a paper in a strange place with strange rules, cd instructions, invigilators etc but you can do "mock testing at home" if you get them to focus on the paper, not their surroundings - ie to concentrate on their desk, their work - frankly they could be sitting the test in an empty room then. Certainly neither of our children did mocks and most of the people we know didn't as they are not readily available in this area and we, in line with most people I suspect, would never have considered traipsing halfway round the countryside to sit a mock!
Ditto tutors - some tutors are excellent, worth their weight in gold, but there are other equally shocking tutors or centres who rely on panicking parents into paying for services that frankly they could do themselves for nothing. If you do go down the route of a tutor/centre try and use a personal recommendation of someone/somewhere that has proven form of getting children into the school you are targeting. And always remember that your child is a child first and foremost and should be running and jumping and laughing and playing!