seaplane flying

I'm interested in getting into seaplane flying. I was thinking of converting my old Riot XL to a floatplane as a start. What size of floats would I use?

I live near Peterborough. Is there a water flying site nearby?

How about putting a bit about yourself into the Introduce yourself thread?
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Re floats under a Riot. Assuming you are already a competent flyer, the Riot is about the same size as the HobbyKing Tundra (which comes supplied with a set of floats!) so get yourself a spare set from HK, and try those. :evil:
Be warned you need an excess of power for a float-plane, as water is surprisingly draggy stuff! Landing on water is tricky, too, as soon as the floats 'touch-down' the water grabs them, and you are likely to end up with an inverted float-plane. You have to touch down feather-light, and right on the stall. Hit too hard, and you get bunny-hops, too fast, and it flips over.
You will also find a boat is handy - saves having to swim to rescue your model!
Water sites around Peterborough - I have no idea - best try the 'local' model shop or club for that, they should know who to contact.

After the weather we have had recently I would think there must be lots of flooded fields , shallow enough so boat not needed. Obviously get farmers OK first.