The good agency girls tend to cost £200 plus, takes the risk out of the equation to an extent if you find one who has been reviewed on here but services can be mixed, photos are often severely shopped and an indie at £120/£140/£180 will often be as good/better. I've historically used agency, been lucky enough to have some awesome punts with £180/£200 girls, can't be arsed sometimes with the flaky comms and graft involved in finding a top AW bird.