Singapore Airlines will be rostering a brand new A380 on the Heathrow route from 16th February, operating the SQ305 / SQ322 service.
This will be on Wednesdays, Fridays and Sundays. From April 7 onwards, there will be a switch and it will operate as SQ317 on the London-Singapore leg, flying on Mondays, Thursdays and Saturdays.
Be aware that the airline may need to switch aircraft at short notice for operational or technical reasons. If you need to head to Singapore, however, it is worth targeting this departure if you can.