No, Ludwig, the attempt to win contracts is perfectly open and above board; what's "surreptitious" is what the public might never spot, such as the peerage saga outlined in Octavius's link above...and from The Mail, too!
Apart from the failed elevation to the Lords, we'll never know how much this one man gained personally through Osborne's reduction of the top tax-rate. Mutual back-scratching epitomised right there. But he is only one man, so how many more just like him are to be counted among Tory paymasters?