Portsmouth chalked up their third successive London two south west success with a 19-5 win at league-leaders London Cornish.
Tries from Curtis Barnes, Josh Palmer and Luke Simmons along with two Simon Morgan conversions earned the Rugby Camp club a deserved win.
Portsmouth coach Ben Dudley was delighted with the performance.
‘Not too many people gave us a chance before the game,’ said Dudley.
‘However, we played the conditions better than they did and executed things well.
‘The defensive cohesion which we have been working on was much in evidence.’
The visitors took the lead midway through the first half when full-back Curtis Barnes joined the line at pace to cut through the home defence.
Cornish hit back with a try of their own after the visitors had a player yellow carded for a dangerous tackle.
It was Portsmouth, though, who soon had their hosts back under pressure and, on 68 minutes, Andy Barnes intercepted a pass before putting winger Josh Palmer over in the corner.
Luke Simmons sealed the win when he displayed good football skills to dribble a loose ball through before touching it down.
United Services ended a three-match losing run in London three south west with a thrilling 29-29 draw at New Milton & District.
In Hampshire two, Southsea Nomads played well but suffered a 45-10 defeat against a well-drilled Romsey side, who lead the table.
The game was switched to Romsey because the Furze Lane pitches were flooded.
One encouraging note was a debut try from Paul Hogden.
Nomads coach Jamie Clayson said: ‘The test was a good one and it showed the team is progressing in the direction I want.
‘The first half was very positive when we matched them and they weren’t able to break our defence or spirits.
‘A couple of errors cost us and these are things we have to review and reflect upon.
‘It is important to remember the progress made so far and that developing my style of rugby will take time.’