I just got a piece of scrap open cell foam, sharpened the rim on an offcut of copper pipe and made my own. Pull it out and check every week for a few weeks in case it decides to dissolve
Made a "Filter" up from some Open Cell Foam on an unused / un-required Air Filter I had kicking around.
Changed the Oil this morning so now all sorted.
Hopefully it should be good for a few more miles now.
Thanks for all your helpful Responses, much appreciated as ever....