Start this recipe the night before you plan to make it.
Mix the sultanas, rhubarb and sugar together in a large bowl. Cover with the tea and leave to soak overnight.
Pre-heat the oven to 150°C(fan)/170°C/gas mark 3. Grease and baseline a 2lb/900g loaf tin. Stir the flour and egg into the fruit mixture. Pour into the prepared tin.
Bake in the oven for 1 1/2 to 1 3/4 hours until a skewer inserted in the centre comes out clean. Cover the top with foil if it's getting too brown.
NB: to roast the rhubarb chop into 2cm pieces, toss with 20g caster sugar (or more if you prefer it to be sweeter - I don't think it needs more sugar in this recipe), cover and roast for 20-30 minutes, stirring occasionally, in an oven preheated to 200°C.