Since 1985, in England and Wales abstinence from meat has been mandatory only on Ash Wednesday and Good Friday; on all other Fridays of the year, including Lenten Fridays, the faithful are allowed to choose between abstaining from meat or doing some other penance -- see this document. The bishops there have now chosen to restore the requirement of meatless Fridays.
Catholic Witness - Friday Penance
Every Friday is set aside by the Church as a special day of penance, for it is the day of the death of our Lord. The law of the Church requires Catholics to abstain from meat on Fridays, or some other form of food, or to observe some other form of penance laid down by the Bishops’ Conference.
The Bishops wish to re-establish the practice of Friday penance in the lives of the faithful as a clear and distinctive mark of their own Catholic identity. They recognise that the best habits are those which are acquired as part of a common resolve and common witness. It is important that all the faithful be united in a common celebration of Friday penance.
Respectful of this, and in accordance with the mind of the whole Church, the Bishops’ Conference wishes to remind all Catholics in England and Wales of the obligation of Friday Penance. The Bishops have decided to re-establish the practice that this should be fulfilled by abstaining from meat.
Those who cannot or choose not to eat meat as part of their normal diet should abstain from some other food of which they regularly partake. This is to come into effect from Friday 16 September 2011 when we will mark the anniversary of the visit of Pope Benedict XVI to the United Kingdom.