lost shifter cover

[Blott's Mate]

My new to me Cannondale's r shifter ( 9 speed 105 flightdeck) failed on it's first outing (brake lever moved with it when I tried to change into higher gear, lubing,degreasing & lubing no good). Replaced it. All fine. Cover of l shifter started rattling . Today I went to take the bike out there is was gone. Missing. Absent. It was there on it in the house Monday. Today I looked down when I left the house. Nowhere. Vanished. Have searched & searched. Can't find it.

Have googled & googled & can only find a company in the States that sell them. Any ideas where to get one in the UK. Very annoying!