I know Paul and have bought a car off him in the past as well as a mint EsCos centre console, I'm fairly sure he would trust me with a couple of clips. I would need a scrap/broken clip also to see what sort of plastic it made from, the only easy way to tell is to burn a corner of the moulding with a lighter and sniff the smoke my boss is very good at this but who knows what it does to your health!

A lot depends on what the moulding looks like, my car is jammed in the garage with no real way of getting to the clips for a while yet and detailed high res pics would be a big help. If the mould tool requires "up and aways" or "sliding blocks" it gets far more involved and the cost goes up.

DMS make standard mould bases and I guess you are looking at around £600+vat for the basic materials then labour to make the electrodes, spark erosion, ejection etc, etc.
http://www.dms-diemould.co.uk/

Even on the cheap you would be looking at least £1500 for a mould tool (assuming no sliding blocks or up and aways). You would need to sell 100 sets of mouldings at around £18 a set to break even after moulding costs.

How much demand is there for these?

EDIT there is another way but it involves me making a set of inserts in my own time and bodging them into an old mould tool.
I really don't want to waste a whole load of valuable spare time doing this, getting them moulded only to find that 5 people in the whole of Britain want a set at say £18 a go to find that I've worked for 20 pence an hour for 40+ hours.

Mark