Lord Gayle's other winning progeny included Blue Wind (Epsom Oaks), Desirable, Gay Lemur (Jockey Club Stakes) and the leading hurdler Pollardstown.

Carroll House's dam Tuna, was of little use as a racehorse, but produced several winners including the successful handicappers Brother Kempinski and Jean-Claude.

Carroll House returned to the United Kingdom in July for the Welsh Derby at Chepstow Racecourse and won by one and a half lengths from Golden Wave.

Ten days later he appeared in Germany, where he finished first in the Group One Grosser Preis von Berlin at Düsseldorf but was relegated to third place by the local stewards.

On his first appearance as a four-year-old, Carroll House ran in England for the first time in over a year when he started a 33/1 outsider for the Gordon Richards Stakes over ten furlongs at Sandown Park Racecourse.

Ridden for the first time by Walter Swinburn he took the lead two furlongs from the finish and maintained his advantage until the final strides when he was caught and beaten in a three-way photo-finish by Indian Skimmer and Per Quod.

Three weeks later he appeared at the Curragh Racecourse in Ireland where he carried top weight of 130 pounds in the Tattersalls Gold Cup and finished third to Ile de Chypre.

Swinburn sent the colt into the lead three furlongs from the finish and Carroll House held off the challenge of Assatis to win by a neck, with the future St Leger winner Michelozzo in third.

[9] Eleven days later, Carroll House contested Britain's most prestigious weight-for-age race, the King George VI and Queen Elizabeth Stakes at Ascot Racecourse.

Racing on unsuitably firm ground, he started a 33/1 outsider and finished fifth of the seven runners behind Nashwan, Cacoethes, Top Class and Sheriff's Star.