Well I made some mint spies. Two batches thereof. This is what I learned.
1) our bin tin is very deep. More like a muffin tin really. placing mint spies in the bottom of the holes works, but it is fiddly.
2) paper cases work fine and they mean you don't have to grease the bun tin.
3) shop-bought pâte sablée (sweet shortcrust pastry) works ok but the pastry is very thin and crisp.
4) shop-bought flaky pastry (pâte feuilletée) basically doesn't work at all.
5) the mincemeat is good.
So basically I have to make some shortcrust pastry.