Song is set to be first Bond theme to reach Number One
British singer provides the theme for new James Bond film 'Spectre'
Singer disclosed the embarrassing fact during Nick Grimshaw's Radio 1 show this morning
Theme song comes ahead of latest 007 film 'Spectre'
The song will be released on Friday (September 25)
"I think people might get bored of me if I carry on"
On balance, bookies don't think Smith will pull off the first Bond-theme number one
'Writing's On The Wall' is out on 25 September, the film follows on October 26
Singer had previously denied he was involved in the 'Spectre' soundtrack