The benchmark index of blue-chip shares was boosted once again by strong mining stocks, and closed at 1230 GMT, up 0.9 per cent at a new closing high of 7,687.77 points, having earlier reached a new intraday record of 7,697.62.
Despite economic headwinds and Brexit-related uncertainties in 2017, the FTSE added 7.6 per cent over the year, with more records set to be broken in 2018, according to analysts.
"The FTSE 100 could launch a concerted attack on the 8,000 mark for the first time in 2018," said analysts at AJ Bell.
Meanwhile in the eurozone, stocks fell back, with Frankfurt's DAX 30 ending its own shortened session 0.5 per cent lower at 12,917.64.
The CAC 40 in Paris, which for its part continued trading as normal, was 0.1 per cent lower at 5,332.27 points by mid- afternoon.
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