I take it cost rises too?
Sadly, if you have to ask, you cant afford it.
Promise I dont mean that in the way it could be taken.
However, you will do well to be flying a twin for much less than £300 an hour however you cost it out.
Fact is there is not much you can do in a twin you cant do in a single.
Something like an SR22 will go as fast if not faster, it will go as high, if not higher, it willbe as comfortable and probably more comfortable.
What it might not do is give you the same level of confidence as a twin at night or over a cold sea, it almost certainly will not lift as much load, and the twin will almost certainly deal with more weather (be it ice or turbulence).
You may also find there are some passengers that will be happy to join you in the twin, but not the single! That could well be a mistake on their part!!