Long shot – any chance of an upgrade?

I'm on VS72 from MCO to GLA on 18 July 2015. It was booked by Mrs Fuzzy via Virgin Holidays so we’re in fare bucket V (non-upgradable). I've phoned both VS and VH to get an upgrade from Economy to Premium and these are my options
1 Pay VH £1800 (there’s 5 of us, so that’s £300 each which is pretty much the difference in fare)
2 VS say I can pay VH an unspecified amount to change our fare bucket (any ideas how much?), they can then upgrade 3 of us to UC using my miles, that’s all the availability they have, they can’t upgrade us to PE.
Will there be more availability at a later date? While tempted by UC it would be a bit of a pain to split my party (2 adults, 3 kids) and there’s no Clubhouse at MCO.
So any ideas?
1 Pay VH £1800 (there’s 5 of us, so that’s £300 each which is pretty much the difference in fare)
2 VS say I can pay VH an unspecified amount to change our fare bucket (any ideas how much?), they can then upgrade 3 of us to UC using my miles, that’s all the availability they have, they can’t upgrade us to PE.
Will there be more availability at a later date? While tempted by UC it would be a bit of a pain to split my party (2 adults, 3 kids) and there’s no Clubhouse at MCO.
So any ideas?