Perhaps a WW1-era, Hornblower-esque naval series focusing on young Midshipman Miles Messervy, revealing how he first acquired a taste for cheap Algerian wine.
Only Fools and Horses with spys and smuggling?
“Bond, you plonker!”
Count me in 
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I agree wholeheartedly with this
BUT
If I HAD to choose…
Moneypenny or Leiter in their Craig era iterations could hold a spin-off, both in terms of cast and character…Tanner would be good with Kinnear, but I don’t think there’s enough to the character for anyone to care, I only suggest it for how good an actor Kinnear is in every role.