787 Dreamliner back in service or website error?

I am flying to Dubai next Wednesday 2nd May and the 'my booking' page shows the aircraft type as a 787 Dreamliner, which it wasn't when i originally booked many months ago. The return leg is the A330. However i have checked seat guru, and even attempted a new booking on the virgin site for the same date and it shows the A330 NOT the 787 Dreamliner. Does anyone know which is correct?

See:

viewtopic.php?f=4&t=297115

The MMB page is likely to be more accurate than anything else. This route has been operated by a 787 for the past few days so it’s likely that you will be on a 787 outbound. Keep an eye on your booking as it’s quite possible that the return might change too.

Good to see. Thanks for clarifying