You prob have your answer already as this post is old now, I have looked on streetview and over view of this roundabout, here is my opinion for what it is worth.
There are no road markings on the roundabout so standard rules apply, as with always your actions or the actions of others should have some bearing on your approach, since it is the 3rd exit all traffic on the left lane should be departing on exit 1or 2, but watch out for the idiot driver who either is lost, or incompetant, because they may very well think it ok to stay on the left and keep indicating right, and as such stay on the roundabout.
But if there is no such driver as you aspproach watch for their indicaters, if they are indicating left on the approach there is a good chance they are taking exit 1, if they are not indicating they pose more of a danger to you because they may very well be looking to cut you up, so if you are behind them watch out and see if they turn their left indicater on after the first exit, if they do there is a good chance they are leaving at 2nd exit, Dyke Road Avenue.
You should be indicating left opposite 2nd exit, and moving across when it is safe to do so, if you can move across slightly berfore that then even better, but make sure your indicaters show you are moving across and not trying to exit of 2nd ext as a last min move.
As you pass 2nd exit your indicaters should most certainly be on, and your road position should be at the place where you are turning off and not using 2 lanes to exit.
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