Hiya Naomi
Are you a member of or ever look at the Homeworkshop site -
https://www.homeworkshop.org.uk/
There is a chap selling off large 3 and 4 jaw chucks at present - will probably need to sort your own backplates however.
Did you get the pm I sent re. the MSRVS show? Have a few photos of you and your girls driving.......
Cheers
Grum