Gas locker floor finger strip

Sorry, can't help on the 'fingers'

I think most gas locker floors are similar. I have a bucket in my front locker for any such small, easily lost bits & pieces. 

Sorry I can't help with your search but I also had the gap problem albeit smaller. Built into my locker floor are the plastic gas vents so I knew by sealing the floor gaps it would not present a problem, and after two mice set up home last year it became a priority. I used the expandable foam from B&Q and once set I shaved it neatly with a knife.

I believe this is what you're looking for -> http://www.ebay.co.uk/itm/Swift-Caravans-1091266-BOTTLE-BOX-BIRD-COMB-1M-STRIP-2010-Spec-1007-/281834706532

That's just the first one I found, there may be others.

 Great stuff. Thanks!!

That is just what I had in mind.

What did you search on to find that, "Bottle Box Bird Comb" didn't immediately spring to mind.

After a bit more searching "Bird Comb" it looks like it is the same strip as used to seal the eaves of houses from bird invasion.

I think I searched for "swift comb" but I can't recall now   It's certainly what we have in the locker on our 2014 Swift 'van.

Be careful about filling in any vents where gas bottles are stored. In the event of a gas leak these vents let the gas out. LPG is heavier than air and sinks in the event of a leak, if it can’t escape, BOOM!! 
use a bit of metal mesh.