Trigger Index Shifter - 7 Speed Shimano (Mulbarton NR14)

It seems that my index shifter was vandalised. The plastic was broken but the shifter mech seems jammed - as I hobbled home in low gear from the city.
 Anyone with a pair of shifters to spare? Bike is scratched and old but I’d like to keep it running as long as possible [as it’s a nimble little ride].

Cheers. N
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