A Welsh Government spokesperson said:
"We do not control the tolls - the UK Government do. That's why we have called on the UK Government to open discussions with us on the arrangements governing the Severn Crossings after 2018."
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Swansea relieved the pressure on under-fire manager Bob Bradley with an emphatic 3-0 home victory over fellow strugglers Sunderland.
Sol Bamba was sent off after losing his cool but Cardiff hung on to claim a deserved 1-1 draw at Ipswich.
Today's rain will soon clear south-eastwards to leave a largely dry night with some long clear spells.