@Martin.
My whole cage was only about £250 to get welded in, and the welds are really neat and they did it in a day. 3 days is a little long would need it turned around whilst I wait really as wouldn't have anyway to drop the car off and get home
My rear cage was £100 for the plates to be welded in and fitted.
If you're interested, give them a call, sure you could get it done whilst you wait if you booked a slot. I did it on the side thanks to Kelv, who knows the guy. So that's why it took a few days, which worked better for me anyway.
01737 772243 - Ask for Carl (manager) or Mark (welder)
Just had a quote from Mark Fish £360! Just for the drivers side