If Paul Silk and his colleagues come back this autumn with a recommendation that the Assembly should gain powers to raise more than the "peanut" taxes like the aggregates levy and air passenger duty, then it's Labour who will have the greatest difficulty in accepting much beyond this - and will be the most exposed by being in government.
Meanwhile, the Assembly Finance Committee, following a recommendation from the Consumer Council, is to call for an inquiry into the high cost of insurance in Northern Ireland.
It is urging families and patients with cystic fibrosis, including those with hopes for future drugs in the pipeline, to contact their assembly members and ask them to lobby Mr Drakeford not to accept the recommendation.