engineertony
When a company manufactures in the UK, it pays wages to UK citizens, it rents UK factory space, its buys UK supplied power, it pays UK NI and Income tax contributions, its employees eat lunch, drive to work etc etc. Agreed that profit and a proportion of revenue goes overseas but some also remains in the UK and that is how it adds to our GDP.
When it comes to the farming analogy, you suggested that the successful ones had taken over the less efficent and were employing them to work for less, so already your successful farmer was now a manager, probably spending more time at his desk than in his fields, similar in fact the head of pretty much any significant business, manufacturing, farming or otherwise. The CEO of BP is a clerical worker, not a manual worker. Secondly, the service of looking after the successful farmers money, and giving him more back than when he started is a vocation in itself. It may also involve much sitting down, and perhaps less time with tractors and cows, but is probably best not described as cheeky. By the way, the best paid CEOs in the UK work for Reckitt Benckiser, Tullow Oil and BHP Billiton, none of them service related as far as I can tell.