Why can I change one seat but not the other?

Help

Booked on VS031 out 22 APR11
and VS032 ret 1 MAY
LGW - St Lucia
K class PE seats
When I booked in December load check showed plenty of availability. I could change out seats but not return.
Ever since I have not been able to view/change the return seats.

Any ideas why? Can anyone load check for me?

Thanks all

J3 D2 R0 Z0 W0 S0 K0 Y9 B9 L9 M9 Q9 X9 N0 O0

[Neil]

So PE is totally sold out.

Also, don't forget that firstly only 60% of seats are available for pre-selection, but also in PE Virgin Holidays have an exclusive pre-allocation of the front half of the upper deck, so it really does limit the amount of seats that can be pre-allocated by direct bookings.

Neil