I note what TonyQ says about operations post 30/9/15, however interestingly I have a STN-IOM flight on 9th October and I have had an email this afternoon that informs me that my flight will be operated by VLM. Might it therefore be around a bit longer, perhaps until the end if the summer schedules?
I agree that it represents a drop in capacity however given my previous experience of the stansted service, and overhearing cabin crew, it would appear that loads are often quite small so in reality I don't think the reduced capacity will be an issue.