I am somewhat obsessed with the Ember Days. In the Book of Common Prayer (1662), the Advent ember days are the Wednesday, Friday, and Saturday after S. Lucy Day (13 December). These are listed as days of fasting and abstinence. And:
Then the Curate shall declare unto the people what Holy-days, or Fasting-days, are in the week following to be observed. And then also (if occasion be) shall notice be given of the Communion; and Briefs, Citations, and Excommunications read.
Excommunications! Wow! That would be interesting. Anyway, here is the Collect from the Book of Divine Worship (which, I think, is also the Collect in The English Missal)::
Ember Wednesday in Advent
GRANT, we beseech thee, Almighty God: that the coming festival of our redemption may obtain for us the comfort of thy succour in this life, and in the life to come the reward of eternal felicity; through Jesus Christ thy Son our Lord, who liveth and reigneth with thee, in the unity of the Holy Ghost, ever one God, world without end. Amen.