Roasted summer vegetable and feta quiche

Ingredients

• g/8oz plain flour, plus extra for dusting
• salt
• g/3oz cold unsalted butter, cubed, plus extra for greasing
• g/1½oz cold vegetable shortening, cubed
• large red pepper, deseeded and cut into bite-sized pieces
• large orange pepper, deseeded and cut into bite-sized pieces
• courgette, cut into bite-sized pieces
• ½ tbsp extra virgin olive oil
• large free-range eggs
• large free-range egg yolks
• ml/2fl oz full-fat milk
• ml/¼ pint single cream
• g/4⠓oz feta
• salt and freshly ground black pepper