Indeed VY is non refundable - I knew it was four airlines that an exception, turns out the 4th is I2...
refund (in each direction)
Permitted with a surcharge of €25 up to 24 hours before the departure of the first flight on the ticket, as long as this does not include any IB5XXX flight. Refunds only permitted on flights with codes IB, YW, I2 and BA, unless the code for one leg is IB and the code for another leg belongs to another partner in the programme.
If I understand this correctly:
IB/YW/I2/BA = ref
IB+other airline = ref
Any other airline/combination = nonref