Sorry to ask another simple question, but the SQ website is ambiguous on this one.

Flying J LHR/SIN/MEL then SYD/SIN/LHR on 317/217 and 232/320

do these flights require an Empower adaptor? this is what the SQ site says.....

In-Seat Power Supply

* 110 V AC in-seat power supply system
Our 110 V AC in-seat power supply system lets you stay connected to your favourite software, games, and music from your laptop for the entire flight. Singapore Airlines offers in-seat power supply systems in First Class and Raffles Class seats on selected B747-400s and B777s. In-seat power supply system is also available on Raffles Class and Executive Economy seats on all A340-500s.
The 110 V AC system supports Australian 2/3-pin, European 2-pin, Japanese 2/3-pin, and US 2/3-pin plugs. An adaptor is required for plugs that are not compatible with the system and can be purchased from KrisShop on board or via mail order.
* 15 V DC in-seat power supply system
Singapore Airlines offers 15V DC in-seat power supply in First Class and Raffles Class seats on selected B747-400s and B777s. The 15 V DC in-seat power requires an EmPower-approved adaptor for its use.

Thanks again for any help. I'm ok with the 110V option, but not the 15V one and i'm not sure which "selected 747-400 or 777s" I'll be on!