Pierre Williams from the Federation of Small Businesses told ITV News that if the Funding for Lending Scheme fails, the Government will have to "look carefully" at whether high street banks are the 'right conduit'.
The £80 billion scheme will give money to banks on the basis that they provide cheaper loans to kick-start lending.
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The Labour politicians put their alleged differences aside to jointly highlight how remaining in the EU could help fight climate change.
Late sunshine here and there this evening - but more cloud for southern Scotland, northern England and Northern Ireland again.
Pro-Leave campaigner Boris Johnson has responded in a politely worded letter to Jean-Claude Juncker's invitation to "come back to Brussels".