ok chaps, on tyre in white lettering about 2" high are the letters MYP?VM??.
Embossed on tyre 1/3" high is 27A 2087 and FC(R17( - N
On top of main leg is PC 7, on other side of leg, on a small plate are the small digits 400016 21 H 0798.
Clearly fairly old since the alloy wheel casting has actually corroded through in places, not easy to see on pics, but it has been in a field until now?
Cheeers