It's pretty quick as boats go, not many will go that fast, very few will go faster.
Most of the cruisers you see out in the Solent would have top speeds of 30ish knts max with clean bottoms
would you be Ok if you reached international waters?
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Depends on what they are after. There is a principal of hot pursuit which enables boats/aircraft all ready in pursuit whilst in the territorial limit to continue until capture or entering other territorial waters.