Andre: Starting at Lowestoft
moving South, Pakefield Beach has a fantastic wide sandy beach, shallow gradient into sea at low tide, small chop and waves.
For wind direction SW through east to NE, Kessingland Beach which is shingle and sand has some nice waves and drop off ledges as entering water.
For wind direction SW through east to NE, Southwold at the Harbour end of beach has a wide sandy beach, with some good wave action for kickers or messing about in. The sea can be quite rough on bigger wind days though!
For wind direction SW through east to NE, Walberswick has a shingle and sand mix beach, which is quite narrow at high tide. I would advise to kitesurf further south than the harbour wall and away from the regular tourist beach. There are some nice waves here and also some shallow spots with sand bars appearing further out at low tides.
For wind direction SW through east to NW, Aldeburgh's shingle, stony beach becomes deep quite quickly and there are medium chop water conditions.
For wind direction SW through east to NE, the shingle and sand beach at Sizewell has some big wave forming at times. You need to be wary of the platform out at sea and steer well clear of that for safety. It's one of the few spots that could work if the wind is more northerly.
For wind direction SW through east to NW, at Old Felixstowe Ferry's shingle and sand beach, you need to be wary of strong currents into and out of the River Deben river mouth. Experienced kiters only could use the river mouth to good effect but on lower tides, the ever changing shingle bars either side of the River Deben channel form to make islands and subsequently some nice flat water spots on the downwind sides of shingles bars.