Contrary to received wisdom, the British are not an insular people in the conventional sense - far from it. For most of their early modern and modern history, they have had more contact with more parts of the world than almost any other nation - it is just that this contact has regularly taken the form of aggressive military and commercial enterprise.

It would be wrong to interpret the growth of British national consciousness in this period in terms of a new cultural and political uniformity being resolutely imposed on the peripheries of the island by its centre. For many poorer and less literate Britons, Scotland, Wales and England remained more potent rallying calls than Great Britain, except in times of danger from abroad. And even among the politically educated, it was common to think in terms of dual nationalities, not a single national identity.

Ever since the Reformation, the case of legislation confining Catholics had been constructed primarily to protect a nervously Protestant against what was assumed to be a fifth column in its midst... Ministers believedm with some justice, that Catholics retained an attachment to their exiled co-religionists, the princes of the House of Stuart. After the Battle of Culloden had confirmed Jacobitism's insignificance, however, government attitudes towards Catholicism began perceptibly and logically to relax.

The pre-war empire had been sufficiently informal and sufficiently cheap for Parliament to claim authority over it without having to concern itself too much about what this authority entailed. The post-war empire necessitated a much greater investment in administrative machinery and military force. This build-up of control had to be paid for, either by British taxpayers or by their colonists.

Most Britons still lived and died without encountering anyone whose skin colour was different from their own. Slaves, in short, did not threaten, at least as far as the British at home were concerned. Bestowing freedom upon them seemed therefore purely an act of humanity and will, an achievement that would be to Great Britain's economic detriment, perhaps, but would have few other domestic consequences.

Loyal and substansial Catholic service on the battlefield undermined one of the most longstanding objections to emancipation: namely, that since Catholics owed religious allegiance to a foreign authority in the person of the Pope, their political and patriotic allegiance must necessarily be suspect.

In the past, the British had signally failed to build an effective structure of royal authority and administration in their American colonies. As a result, no possibility existed of soothing and winning over influential and talented Americans, in the way that influential and talented Scotsmen were increasingly being won over, by giving them increased access to state employment.