It's not the number of roundabouts that makes Swindon hard, it's the number of lanes per junction and the proximity of the spot islands to each other.
For reference, Colchester also has a "magic roundabout" with the same structure of Hemel's but Swindon's is easily the worst of the 3 because the whole thing operates as one junction due to how tightly packed the roundabouts are. Whereas Hemel and Colchester can be treated as 6 and 5 (respectively) separate junctions circling an island. That makes a huge difference when driving around these kinds of roundabouts.
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It's not the number of roundabouts that makes Swindon hard, it's the number of lanes per junction and the proximity of the spot islands to each other.
For reference, Colchester also has a "magic roundabout" with the same structure of Hemel's but Swindon's is easily the worst of the 3 because the whole thing operates as one junction due to how tightly packed the roundabouts are. Whereas Hemel and Colchester can be treated as 6 and 5 (respectively) separate junctions circling an island. That makes a huge difference when driving around these kinds of roundabouts.
My taxi driver at Hemel decided the inner circle was one giant American roundabout and ignored the other little ones.