Streelite WF 55106 & 55107 MX62 AXH/MX62 ANR are currently in use in all over white livery, on new route 20 in Leicester.
I believe these may have come up from Somerset.
First Leicester have some Enviro400s cascaded from Bolton. They have been refurbished with black seats plus a few purple lines and repainted into an orange livery for routes 14/14a.
They also have some Eclipses, at least some cascaded from Somerset, in a lilac livery for route 18. Other are red and yellow for routes 88/88a. Ironically, these are the former Midland Fox colours!
Other First Leicester vehicles are StreetDecks and StreetLites, some in urban livery with fuschia (sometimes nicknamed raspberry) fronts.