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It was certainly a lot of fun, was my first go on a track. You can get a lot more track time for less money (and still get instruction) at track days. If you are worried about your own bike then there are a few places that'll hire supersports bikes.
I didn't pay nearly £300 though, had a voucher with a significant discount. It's certainly a very easy way to get some track time though.
Was it worth the £300?
I looked and saw the price and thought it was a bit steep.