A word of warning to anyone tempted by these:
All well and good, now the warning.
Make sure you read the small print. The bag must be placed within 4m of the boundary of the house or they will not collect. Foolishly, I assumed that with a driveway that can easily fit 5 cars and a 12 foot wide entrance, they would have no problem collecting from more than 4m away. Their vehicles have an arm which picks up the bags. I thought they'd be able to back their truck in, and use the arm to collect the bag from behind the vehicle. Apparently, they are not allowed to do this. It's got to be within 4m of the roadside, or no pickup.
They will collect with a different vehicle for an extra =A338 or so, which is probably what I will have to do. There's now way I'm unloading a 1.5tonnes of concrete, soil and rubble,moving it 6 feet, and putting it all back in again :-( Life is too short.
Anyway, just to warn others. And please, for those tempted to reply along the lines of "should have read the instructions", "shouldn't have assumed...", please don't bother. I know. This has ben a public service anouncement.
Jon.