Vin is, in my opinion, first and foremost a club or concert hall performer. May be ok on tv (i'm sure he's probably done it!) but not unless it was in front of live audience. Perhaps a show like 'An Evening (or is it audience?) With Vin Garbutt', might be great?, i dunno.
Don't think comparisons with the brilliant 'big yin' is vert fair. Both different styles. Billy is first and last a comediene. Vin is very very funny but it's his singing and playing style that makes him a must see for me, the comedy is a bonus! Oh and yes, i reckon it would be difficult to put across any of his songs as Vin does, although Vin and Bob Fox sound great to-gether.