If that's all that Glen Allerton said to you, I'd say he is a bit of a wanker.
Seems there is a whole lotta cash burning in your pocket Matty, what with all these track days, I suppose you're not buying bling anymore, which is a good thing.
So what I'm saying is, I think you've already made a decision, just go out and get the bloody thing!
BUT, this is my point of view, don't get a Trumpet. A little R6,CBR600 or GSXR750 would do (both of) you fine. Parts are probably (I might be talking out of my arse here) cheaper than the British bike.
And you could probably pick one up already track ready.
Or there is the Aprilia RS125.