Although a quasi-legislative fix (i.e. guidelines for the clergy) could be introduced relatively quickly by means of a House of Bishops Statement, as we have seen with the Statement on Same Sex Marriage, this would cause difficulties in its implementation and problems for its enforcement were a challenge to be made. (It is estimated that about a quarter of CofE clergy administer the Sacrament of Reconciliation, i.e. Confession.) However, a change to the Proviso to Canon 113 would require full synodical consideration and could take considerably longer.
Thus in answer to the question “Is the CofE to axe seal of confessional?”, it seems inevitable that some changes will need to be introduced but: these may take some time; and will certainly put pressure on the Roman Catholic church, as in Australia, the US and elsewhere.