Yellowing leaves is usually a sign that the roots are not in the best of condition since fertilizer is there, and they usually don't need that much really. The french say you should not fertilize at all in the year you plant garlic, just what is left from previous crop (not entirely sure that's optimal).
Roots can be attacked by a fungus, just underdeveloped due to water, partly dead due to water, etc. Some varieties are much more adapted to wet weather and some to dry. Look at what thegarlicfarm sells in UK, those should more or less do well in the normally wet uk conditions.
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