Thanks for your response Peter, and glad to hear your intercooler is still going strong.
So the Jag dealer cost for the new intercooler is now £350+VAT for retail, all local Dealers to us are the same price. Guy Salmon Ascot offering the best trade discount. Any other OEM replacements for approx same cost are out of stock, with only a Nissens intercooler being available for £500, so I am obviously going with the Jag part. Unfortunately I am not tackling it myself as I don't have ramps/axle stands and I thought I might potentially have other issues so arranged with a Mechanic to do the work as I know and trust him, although I am fairly handy but I am also aware a little knowledge can be dangerous.
Good tip re the fixings, I will mention it.
Hopefully this will be the last bill this year, as I had a major service and timing belt changed in February, plus a couple of tyres.
I have noticed my drivers window is now quite slow, was that the symptoms before you replaced yours?
I will also replace the springs on the boot as I believe that is the cause for it not to open fully when pressing the keyfob button, but need to scour the forums if its just the springs or also the hydraulic rams.