Air France has 2 flights a day from LGW to Nantes using a CRJ.
AF5851 departs LGW at 0755 and arrive in NTE at 1005.
AF5855 departs LGW at 1935 and arrive in NTE at 2145.
British Airways operate 1 flight a day (GB Airways flies the route I think) as BA6806 and departs LGW at 1445 and arrives in NTE at 1700 using a B737.
Hope it helps,
AF Cabin Crew.
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Photo © Alain Mengus