The Britain-based Syrian Observatory for Human Rights has said "tens of people" were killed in an air strike by a Syrian Air Force fighter jet, which hit a bakery in a town near the central city of Hama.
Rebels have been clashing with government forces is recent days in the region around Halfaya, some 25 kms (15 miles) north west of Hama.
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Mayor of London Sadiq Khan is backing the scheme.
Sunday will be a fine day across much of Scotland and northern England, with much less coastal mist and low cloud than yesterday.
A spokesperson said the lightning strikes had left the "aircraft fuelling system unavailable."