Big thank you to everyone who provided great advice!
I will give Jaguar a bell in the morning as am trying to save some funds for an exhaust upgrade and a few other bits...will def get some pics up soon once the weather gets better!!
I had a look at the link that shows fabricating some centre caps (thanks to richw911), but wanted to do something that doesnt involve me dismantling the one's i have...is there a centre cap i can buy that i can fiddle with to cover the centre hole - like the BBS one's in the pics from Steve_PD - how did you do this bud?

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Fully agree that they look best as they are but knowing my luck, some git will nick them and i would rather take them off and only put them on for special occassions

P.S - i think they are the BBS one's as opposed to the VW one's that came on the anni, if that makes any difference...
Cheers