That problem should be solved soon I believe.
From what I've heard Streetlites are moving from Bath to Weston. Lots of rumours about which Streetlites and what will go the other way - some say the B7TLs from the 7 and others say E200s.
I have been told by several sources, the Darts and E200s in Weston are going and are being replaced by Streetlites. I believe, replacements for the B7TLs are also trying to be found in the form of E400s.
Weston allready have 8 Streetlites, 47551-47553 are used on Excel Services, so this leaves 47557 in unbranded airport livery, 47556 in Mticket pink and 3 in Urban. With these 5, only 3 more need to be found to operate the 3s and 5s, provided they are not used to cover for B7TLs on the 7s.
To put Streetlites perminantley back on the 7s now would be a retrograde step, I know the B7TLs are older but when one of these replaces an E400 on Excel services and a Streetlite is substituted, they struggle wity capacity on the 7s. I would say E200s as they are pointless in Weston now, unless something is being brought in from elsewhere for Bath.