Filtering (moving between, or down the outside of, lanes of stopped or slow moving traffic) is legal in the UK. There's a lot of grey area though.
There's no set speed above which it isn't safe to filter, though most people put it at 40mph or less. Also you might get pulled if you seem to be dangerous. Filtering round the wrong side of traffic islands, etc. will at the very least get you told off by a wagging finger.
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