Just to follow-up on this one, I started looking in December for someone to do this job for my Alphard in Cornwall. Snows in Plymouth were really helpful but quoted over £1200 to do the work. My local garage (Devonshires in Torpoint) offered to help. They made up a tool to do the job and sourced the parts from Snows (bushes x 2 at £310 + VAT total) the whole thing cost £730 including the cost of tool making. They then did my son’s Alphard shortly afterwards for £700.