Well, job done - 70-300 bought and Sigma 100-300 sold. Very pleased so far. Lightweight, focussing not quite as fast but OK. Keeping IS in mode 2 to allow for panning seems to work well. Small crops of snatch shots - more successful than attempts with 100-300mm. When I get the cashback i'll be able to get one of those camera straps as recommended by Harry.
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