To quote an insurance assessor I used to deal with regarding an l reg fiesta"if the ashtrays full,I'm writing it off!!!!!".
As said above,quick buy back will be worth it as I doubt they'll value that more than £150 in scrap value(not car value,just what salvage firms will pay).
It may need a VIC check due to age but again this is dependent on insurance companies interpretation,don't get hung up about it,it takes 10minutes and £41.
Unless the micras post 2001 it's a goner as well.