Basically...I buggered mine up, so I am looking for a replacement.
Looks like this:
Left hand crank, silver, 175mm - doesn't matter if it say shimano, or 105 or tiagra or sora.
Alternatively, should I find no luck in obtaining a replacement then a 175mm compact crankset would be a suitable, if not more expensive, option.
Looks like this:

Left hand crank, silver, 175mm - doesn't matter if it say shimano, or 105 or tiagra or sora.
Alternatively, should I find no luck in obtaining a replacement then a 175mm compact crankset would be a suitable, if not more expensive, option.