power flushing radiators - is it extremely expensive?

[rey]

I've put it off but think we will need to have it done before next winter.

We paid £300 + another £135 when there was a complete blockage in 1 particular radiator.
Now they all blast out heat, like never before.

Thanks flossie that's no where near what I was dreading so can sleep a bit more peacefully

had mine done a few years ago and iirc it was £300
but it's money well spent