In reply to:

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I've noticed a strange side effect though - a desire to drive at least 10 miles to buy convenience items that I'd normally just go down the road for.

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I have a similar issue with one of my siblings - chipped his TVR Chimeira 4.5 and did a serious bit of outlet manifold insulating. Now when he comes round for a chinese he is insistent that I don't get the food in before he gets here. We go down to the restaurant via the roundabouts!!!

Wheeeeeeeeeeeeeee! Much sideways-ness