[2] In 1970 the Italian director, Franco Zeffirelli, offered Grimes the lead role of Francis of Assisi in his biopic, Brother Sun, Sister Moon.
Anderson offered him a part in his production of David Storey's play The Farm, the success of which established Grimes' reputation in British theatre.
[3] Grimes' most significant film role to date is the part of Major Fuller in Richard Attenborough's A Bridge Too Far (1977).
However, he is probably best known, in his native Ireland at least, for his performance as Father O'Connor in RTÉ's drama series, Strumpet City.
In 1981, Grimes received a Jacob's Award "for his detailed and exceptionally convincing portrayal" of the young priest.