As an aside, I plan to do another comparative analysis of Ryanair's respective programmes from MAN, LPL, LBA, EMA & BHX in about one month from now. I'm waiting for the Summer 2016 programme to settle down before undertaking this.
That will be worth reading Shed and I'm sure you are wise to wait.
That said, with the growth already announced by Ryanair at the SE airports, I hope there is still scope for capacity increases at MAN. That announcement for STN, LTN and LGW perhaps highlighted how slightly misleading percentage increases can be. STN has a modest 5% increase compared to 13% at LTN.
Yet at STN it amounts to about an extra 56 weekly flights to 1,200 compared to around 14 more at LTN. Both significant though for those two airports.