Roasted summer vegetable and feta quiche

Name: Roasted summer vegetable and feta quiche
Ingredients: 225g/8oz plain flour, plus extra for dusting; pinch salt; 85g/3oz cold unsalted butter, cubed, plus extra for greasing; 40g/1½oz cold vegetable shortening; 1 large red pepper, deseeded and cut into bite-sized pieces; 1 large orange pepper, deseeded and cut into bite-sized pieces; 1 courgette, cut into bite-sized pieces; ½ tbsp extra virgin olive oil; 2 large free-range eggs; 2 large free-range egg yolks; 50ml/2fl oz full-fat milk; 150ml/¼ pint single cream; 120g/4⅓oz feta; salt and freshly ground black pepper