Hi Noel
I finally managed to trace Thomas Phillips Vokes back to the de Vaux family - but it was via the Barker family and many an heiress and Lord! The Oliver de Vaux that went to Limerick with King John was amongst them - perhaps the family story had been passed down via the Barker family. You can see the ancestry via the Barker family and Thomas Wentworth, Lord Wentworth on my tree:
http://trees.ancestry.com.au/tree/17995240/person/2813740002...Cheers
Sandy