2020 UPDATE EDIT (READ FIRST): Please note that this thread has been resurrected only to provide an update on how my choices fared (see post #15 below), the request for suggestions has long been solved.
I have been happy for a number of years with the size and features of my Microsoft Wireless Media Desktop set (Wireless Keyboard 1000 v1 + Wireless Laser Mouse 5000 v1), but it has now come to a time in which despite this, I am no longer willing to put up with the annoyances caused by the position of the receiver having to be adjusted when it's not in the perfect spot for both the keyboard and mouse, and thought I should finally make the switch back to wired.
As a result, what similar (inc. media keys, integrated numpad, mouse side buttons) options do I generally have, preferably low-cost (around £30)?
Thanks in advance.