OK, popsycal, here you go - actually having written it out I notice the rasps aren't sieved, but if pips would be a problem you could do. It's actually from an old M & S book and is called "American Refrigerator Cheesecake" (sounds a bit crunchy but it is lovely):
225g digestives
100g melted butter
450g cream cheese
50g caster sugar
2 egg yolks
225g fresh raspberries (frozen thawed OK in Dec, obv!)
150ml double cream
1 sachet gelatine powder
4x15ml water
Put biscuits in greaseproof paper, crush finely with rolling pin, put crumbs in mixing bowl and combine with melted butter. Using metal spoon press into base of 8" loose-bottomed cake tin (non-stick pref). Chill in fridge for min 30 minutes.
Put cream-cheese, sugar, egg yolks and ¾ of raspberries in bowl and mix together. Whip cream until it holds its shape and fold into mixture.
Sprinkle gelatine over water in a small heatproof bowl and leave until spongy, then place bowl in pan of hot water and stir over low heat until gelatine has dissolved. Remove bowl from pan, leave to cool slightly, then stir into cheese mixture. Pour into cake tin over biscuit base and chill in fridge for min 4 hours until set.
Remove cheesecake carefully from tin, (leave base on if stuck) and place on serving platter. Top with reserved raspberries.