Prime Minister Theresa May's Conservative Party avoided a wipeout in London local elections and eked out gains in Brexit-supporting regions elsewhere, early results on Friday showed, although her Labour opponents did gain ground in the capital.

The elections are viewed as a gauge of public support for May as she faces a possible revolt in parliament over her strategy for leaving the European Union.

Partial results showed May was likely to avoid the kind of widespread losses that would dramatically weaken her authority over Conservative lawmakers ahead of key tests of her plans to pull out of the EU customs union.