Brain-Teaser 468

From The Sunday Times, 17th May 1970 [link]

In a home association football championship, where each of the four countries plays the others once, the teams were very evenly matched. The result was that all four countries gained the same number of points and all had the same goal average.

England were the highest scorers in any one match, scoring 6 when beating Northern Ireland, and this also proved to be the match with the greatest number of goals. Second highest scorers were Northern Ireland, scoring 5 when beating Scotland, but there were more goals in their match with Wales when they scored 4.

In order to decide the champions the team scoring the highest number of goals in the championship were adjudged the winners. There was one outright winner with only 2 goals separating the top and bottom teams.

What was the aggregate number of goals for each team?

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