Need to hire a tow car NOW :-(

its half term and we have booked a week off work to take the kids to Ramslade CC site in Devon.  We delayed until tomorrow due to the high winds and trying to tow from Bristol to Devon wasn't a good idea, but today our Land Rover has developed a fault and has found it's way to a local garage thanks to Green Fag recovery..... What to do? We have two unhappy kids who were really looking forward to the break (as were we) is there somewhere to hire a tow car?.... Any help appreciated...... The kids have gone to bed in the hope we can find something by the morning........ <sigh>