London-listed energy giants shake off windfall tax jitters

London-listed energy firms shook off concerns over the impact of a looming windfall tax on their excess profits during opening exchanges this morning. The capital’s premier FTSE 100 index edged 0.09 per cent higher to 7,529.53 points, while the domestically-focused mid-cap FTSE 250 index, which is more aligned with the health of the UK economy, [...]