Don't seen E12 mentioned specifically just that there's 2 types built by yutong and don't know if anyone has mentioned what type per bus for what route, however from this I assume that E9L are nearly guarenteed to be brought preferably kinch 5, campus/sprint as tighter roads needs the smaller bus which is a total pvr of 8/9 meaning only 1/2 spaces left depending if E9L is 10 or 11 batch which will allow for kinch2+spare 2 spares or just kinch2 or the spare as kinch 2 is 1 pvrFirst 11 due in October, remaining 10 early next year. Confirmed as Yutongs (some of them E12s) according to the Leicester Mercury.
So E10/12 are nearly guareneed for kinch 11/12 and Kinch 9 as that's a total pvr of 7 meaning atleast 3 spares
So In all makes sence for there be 2 spares of each type making kinch 2 a E10/12route (although could be either) making E9L the 11 batch for 2 spares and E10/12 10batch with 2 spares as I don't see E10/12 having atleast 3 spares mabey 4 if E9L only has atleats 1 mabey 2.
Plus volvos+versa=9 as current as MMC spares are mostly skylinks so a batch of 10 E10/12 seems reasonable and solos/sr is currently 10 11 if include the burned down number 7 so makes sence to be a E9L batch of 11
Current pvr for the electrifying routes
2 = 1 pvr
5 = 2 pvr
9 = 3 pvr
11/12 = 4 pvr
Sprint/campus = 6/7 pvr