I'm guessing you are asking if there is a restriction barring break of journey on a Birmingham Stns to Market Harborough Off Peak Return (SVR) ticket?
This ticket has restriction code 2V. There is no break of journey restriction, so you may break your journey en route at Leicester.
(Anytime tickets are advertised as always permitting a break of journey, and the return portions of Off Peak Returns, always permit break of journey according to The Manual)