Personally, I would not recommend Parkhill for beginers to practise eddy manouvers. Especially at this high water level. The only workable eddies are in the middle of the river, and both are very squirrely. Also, a bombproof roll is necessary as a swim in the main current would mean your boat (and you possibly) going a long way down river.
Wait for more user friendly spots to some into effect, or the warmer weather when a swim is not as consequential.