Flybe's S09 shows a daily IOM(was double daily this year)which in view of the current financial climate, together with Aer Arann starting IOM-LCY, is probably about the right balance.
Note that on Tu/Th/Su, the arrival time into LTN from the IOM, has a gap of about 3.45hrs before the departure back to the IOM. Could this be for a possible JER ops, in light of easy withdrawing, or something else.