The London Japanese Culture event Hyper Japan announced on both their Twitter account and Website that the anime singer Natsuko Aso will be performing at the event next year. She will be at the event on both the Friday and Saturday, being the 24th and 25th February. She will not be attending the Sunday date of the event.
Natsuko Aso has quite a few anime titles to her name, including the opening songs to Baka and Test - Summon the Beast and Modern Magic Made Simple and the ending theme to Tantei Opera Milky Holmes Dai-Ni-Maku amongst other titles.
If you would like to purchase tickets to this event (which i will be ^_^) the Hyper Japan ticket site can be found here. Also, for more information on Natsuko Aso and her other works, you can check out her website here