For those who don't perhaps know, on the 1st gen Wee and Vee, the tipover sensor iis located above the ECU and is rubber mounting that attaches to the seat tray. It is identified by the "UP" imprinted on top of it.
On tipover, the function is to shut off the engine when the bike is tipped over more that a certain designed angle. if the tipover sensor is the wrong way round or not one the UP position, the fuel pump only activates for 1 - 3 seconds.
The tipover sensor should give a C23 fault reading is malfuctioned and is reset by having the bike vertical and may require switching it on and off a few times. Key is to give a moment with the ignition off before switching on again. Unsually to reset it, get the bike up-right and turn the ignition off, wait roughly a minute, then on... and the bike should start.
As stated above, the clutch switch connector often comes adrift either as a result from the fall or during the picking up process.