What ever both parties can afford. If the bride's parents can't or won't chip in, I'd suggest settling for a small affair, 8-10 close family and call it good.
My first wedding was us two and two witnesses in front of a JP. 2nd one,my wife paid for most of it as her parents copped out after the fact.
I was poorer than a church mouse and would have settled for another JP and 4 in attendances
