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Make the brittle: oil a baking sheet and set aside. Gently heat the caster sugar in a small, non-stick frying pan, stirring until dissolved. Add the nuts. When the sugar becomes a deep caramel, pour onto the baking sheet and leave until completely cold. Snap the brittle into pieces, then pulse in a food processor to coarse crumbs. Can be made up to a week ahead. Store in an airtight container.
For the sauce, whizz the strawberries in a food processor until smooth. Sieve into a bowl, then stir in the icing sugar. Set aside.
To assemble the sundaes, whip the cream with the icing sugar until it just holds its shape. In a tall glass, layer up the chopped fruit, brittle, ice cream, sorbet and sauce, finishing with swirls of cream, more brittle and the whole strawberries.