A government spokesman said: "Medicines licensing, ie ensuring quality, safety and efficacy is not devolved, it is the remit of MHRA".
As income tax is not devolved to Wales or Northern Ireland, their MPs would continue to be able to vote on the rate.
An English Grand Committee would not leave Scottish members of Parliament with "little to do" since the majority of House of Commons business, including tax, public expenditure, immigration, defence, foreign policy and a host of other issues, is not devolved.
Under his scheme, English and (where a matter is not devolved to Cardiff) Welsh MPs would form a "grand committee" to scrutinise, amend and approve such bills before they go before the whole House of Commons.
"Rail infrastructure is not devolved and as such we would not expect to receive consequentials.
"Our position remains that AWB is an employment issue which is not devolved from national government".
Broadcasting is not devolved, but Welsh ministers became involved in a similar debate in 2009.
A Welsh government spokesman said: "The Welsh government has never agreed to fund the electrification of the valley lines because rail infrastructure is not devolved.
Although criminal law is not devolved, Welsh government sources say they want to improve the sometimes "patchy" services available to help abuse victims.
However, everyone in my constituency wants to know whether that applies to the six large wind farm applications, over which planning power is not devolved, and which are currently being heard at the UK's largest ever public inquiry, which started yesterday.
