Des,
You say its a Wilton, in that case you can use Nitromors paint stripper. The reason is its woven and therefore hasnt got a secondary backing. The secondary backing would delaminate, but as its woven it wont.
Just put a drop on, work it with a spatula, spoon, blunt object etc, and when it all loose scrape up the excess and just rinse out.
I have done this loads of times on Wiltons and Axminsters, they will think you are a marvel, unless its an Insurance job then they will hate your guts for saving the carpet.
Good luck.
Murky