aha! found it... this: https://en.wikipedia.org/wiki/Bombay_duckI googled. Weird fish!
Salted and dried. You can maybe get salted and dried Mackerel in an ‘ethnic’ shop in UK.
Those smell.
Doing the leg of lamb is easy, lots of people do it in northern Norway, but the ones I know use slightly older lamb than you can buy in UK.
and i found out why it was banned... maybe now that we're leaving the EU it'll be back on the menu... https://www.independent.co.uk/news/bombay-duck-off-the-menu-for-good-1245301.html