Not sure why you think they are illegal Keith. I had the CANBUS friendly ones with integral resistors mentioned by John above. Since then I changed the front indicators to switchback LED's giving white sidelights switching to flashing amber. No MOT issues.The bulb holders have to be changed to the twin contact stop/tail type though.

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Thread here.

Oh and stay well clear of ballistic resistors wink

Richard

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