After beating City of Bristol 13-11, they followed up with a 16-11 victory over Caledonia, building a 10-2 lead before the Scots rallied late on.
It was an even more dramatic day for Wanderers' nearest challengers, Sutton & Cheam. They began by scoring twice in the last three minutes to snatch an 11-11 draw with Caledonia, who were 5-1 up after the first period. In their second match, they defeated Bristol 11-10, scoring the winner 12 seconds from time through Stephen Bayles after Bristol had a player excluded for a brutality offence.
Exeter demolished Watford 23-6 after scoring eight times without reply in the first quarter.
Portobello and Penguin finished all square at 9-9. Ed Grundy's haul of seven goals put Portobello in front for much of the match but the London club recovered from 8-5 down in the last quarter with goals by Lorenzo Cacciola, Andras Kovacs, Joseph Ortiz and Bence Kadar.