By 1861, Britain was importing a significant amount of their grain and some manufactured goods from the US, border disputes had been solved, and India was a bigger concern. <snip>
Everyone else was unconcerned with the Civil War or unable to really influence the outcome.
1 In 1861/2 the British grain merchants imported much of the glut of grain and milled flour produced in the Union and that they could no longer sell to the South (being as they were at war with the Union). Because there was a glut the British merchants got the grain at a very reasonable price. The excess grain imported from the Union compared to a normal year was not needed to feed the British people. Much of the Union grain purchased by British merchants was subsequently re-exported at a profit. Furthermore the British grain merchants were also key players in the Baltic grain markets through which Russian grain was sold, they could also purchase Canadian, other European, North African and Australian grain if they needed to. Neither was wheat grain the sole or even major carbohydrate component of the British diet. They ate a lot of potatoes, some rice and some other grains such as Rye and barley. In other words although Union grain was a large part of British grain imports they dis not rely on it and they had other sources of supply.
2 Exactly what machines do you think the Union was exporting to Britain in the ACW? Machines were not a significant Union export to Britain they are insignificant in financial terms. Britain on the other hand did export both machines and machine parts to the Union during this period.
3 Border and fishing disputes between BNA and the Union had NOT been resolved in 1861 not even the Pig War. Indeed there are still unresolved border issues between Canada and the USA today that were unresolved in 1861.
4 India, or at least Indian security was not an issue for the British. The First Indian Revolution/Mutiny was over. The revolutionaries/mutineers had been crushed and British reprisals were both savage and thorough. The mutiny was confined to one part of one of the three HEIC administrative regions of India. The army of the HEIC was being integrated with the regular army and it's numbers were being cut. There was no security issue.
5 Contrary to your assertion most of Europe was very concerned about the ACW. They were horrified by the loss of life and the prospect of slave revolts in which even larger numbers mostly civilians would die. On a less altristic note several nations were concerned about the Union blockade and its impact on their trade. They sent warships to the north American coast to observe that the blockade was being properly conducted. These nations included Britain, France, Sweden, Spain and the Netherlands.