I believe Alistair's version did replace the later 2014 (chassis ending 202114 and on) OE 18 pin TSM which integrated the flasher relay, so comments above are relevant to OP's 2015 car, noting both versions require an input from speed sensor.

FWIW I believe Alistair was asking for an earlier car with 12 pin TSM so he could possibly adapt his version to suit.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone