As far as I know; there was no serious offer by UK to sell and by India to buy the SHARS.
In any case the USMC picked up all the RAF Harriers; because they fitted their requirements.
Undoubtedly, the Harriers were a revolutionary design in their time but the IN does not a have an extended role for them, in the way that the Americans have. Neither does India have a force like the Marines (yet) to conjure up a role for these aircraft, to acquire new Harriers.
Incidentally, even the IN's SHARS got acquired mainly because "CAT" equipped Carriers were not available to India at the time. So a new role was created for them, mainly Fleet Defence with a secondary attack capability. Which fitted IN's doctrines at the time. Now all that has changed, the requirements have changed, the assets available are different. The SHARS will fly till they gracefully go into history. If India creates a USMC type of Force then the IN may again look at the Boeing/McDonnell AV-8s afresh for that Force.