Embargoed to 0001 Saturday October 20 File photo dated 02/01/07 of a piggy bank as under-pressure Britons would feel happier if they saved just under £1.70 extra a day, a study suggested today. Nearly two-thirds of those polled (62\%) wished they could put aside more cash and almost a third (30\%) said their mood would improve if they saved an extra £50 each month, equating to around £1.66 a day, research by Treasury-backed financial provider NS&I found.