A federal system never benefits the big states within the country. In the US, virtually all the big states are net contributors to the federal budget. States like Mississippi, West Virginia and Alaska get all the benefits. Tiny states like Iowa and New Hampshire have a disproportionate impact on our electoral process because of electoral college induced federalism run amok. In Canada, Ontario gets the lowest amount of equalization payments, while Ontario pays for the ability of other provinces to have low taxes and high subsidies for their universities and hospitals. So, a federal system would likely hurt England more than it would help.
The experiment with devolution is not federalism, and it happened before Salmond's "Arc of Prosperity" (Iceland, Ireland, etc) collapsed. At this point further devolved powers would be absolutely economically suicidal.
The UK parliament is an English parliament with Scottish, Welsh, and NI MPs added to it. England has no reason to believe its supremacy in this arrangement will be threatened by continued union. Disunion will only hurt the English, and an English parliament would manufacture nationalism where none exists.