I dropped into Red Kite at Shirley (after calling first as it was a bit of a trek). They had bugger all SIDI in stock apart from my size but in a MTB shoe. The fit for length was absolutely perfect and the best I have found. Width wise they weren't perfect (the velcro doesn't completely cover the other bit of velcro (if you know what I mean) but comfrotable non the less.
Obviously I could get a pair of Mega's but as I have found a pair of last year's Genius 5's for £65 quid delivered in the standard fit, I am going to give them a go and save the extra £90 quid it ould cost me for the cheapest Mega's I can find (only seem to be in stock now in 2009 models hence full price).