Martin Lewis is set to take on a guest presenting role on Good Morning Britain.The 49 year old financial journalist, who is sitting on a £12.5million property empire after giving away £20million of his own fortune to charity, is "stoked" as he will take a seat next to Susanna Reid, 50, as they tackle the morning programme. According to the Mirror, the Money Saving Expert founder is due to start his new job in two weeks.