Flapjack Manchester tart

Name: Flapjack Manchester tart
Ingredients: 75g/2¾oz butter; 50g/1¾oz light soft brown sugar; 1 tbsp (25g/1oz) golden syrup; 175g/6oz porridge oats; 50g/1¾oz flour; 1 free-range egg, beaten; salt; 500ml/18fl oz milk; 250ml/9fl oz double or whipping cream; 1 vanilla pod, split lengthways, seeds scraped out; 5 free-range egg yolks; 100g/3½oz caster sugar; 50g/1¾oz cornflour or custard powder; 5 tbsp raspberry jam; fresh raspberries (optional); 35g/1¼oz desiccated coconut; maraschino cherries