Potterne now seem doomed in Division One as they collapsed at Westinghouse to 46 all out.
John Cleverley bowled 11.4 overs and took four for two. Westinghouse went on to win by 10 wickets.
And the relegation battle took another twist on Saturday as Box bounced back from last week's seemingly decisive defeat, to gain a victory at Purton.
Purton were bowled out for 144 and then, thanks to Dave Crawford (55 not out), Box picked up a three wicket victory with just seven balls left.
Nationwide House, perhaps as expected, lost at home to second placed Great Bedwyn. Batting first, Bedwyn made 205-8 with Chris Blundy (55) top scoring.
Despite Eddy Roofe (63), Mick Harris (40) and Shane Thompson (42); Nationwide were bowled out for 198 on the game's last ball, leaving them losers by seven runs.
This defeat leaves Nationwide just three points clear of Box, who have a game in hand.
Leaders Marshfield entertained Collingbourne and with 61 from Tom Edmunds the visitors scored 186-7.
Matt Watson with 3-42 in 14 overs being the pick of the Marshfield attack. Rupert Crockett (8 not out, James Williams (32) and William Pascall (35 not out) then saw the leaders to a seven-wicket victory with 14 balls remaining.
The meeting of third and fourth placed Calne and Bath Civil Service ended with a 23-run win for Calne.
Thanks to Chris Downham (78)
and Lian Botes (36 not out), Calne scored 175-4. Pete Knight then took 7-57 in 14.4 overs as, despite Chris Killen (43), the Civil Service were dismissed for 152.
Division Two
The meeting of the top two at Lechlade, where leaders Spye Park were the visitors, ended in a narrow 15-run success for the home side.
The result puts them on top thanks to having won one match more
than Spye.
Batting first, Lechlade scored 186-9 with Ijaz Khan managing 78 not out. For Spye, Dave Beal took 4-59 in 15 overs and John Beal 4-38 in 14. Dave then top scored with 67 as Spye were bowled out for 171 with two balls remaining. For Lechlade the wickets were shared between Paul Rowley (3-7 in ten balls) who wrapped up the tail after Ijaz had taken 3-42 in seven overs and Matt Southall 1-24 in 15.
Third-placed Cooper-Avon Tyres kept the pressure on as they won at lowly Seagry by 129 runs. Cooper-Avon scored 235-9 with Dean Wallington (61) top scoring as Willy Tidmarsh took 6-51 in his 15 overs.
Rich Jory (4-28 in 13 overs) and Dean (3-55 in 15) then helped bowl Seagry out for 126 in the 30 second over. Ian Thurgood top scoring with 40 not out.
Buscot Park who had started to drift into the danger zone picked up valuable points at home to Burbage & E.R.
With Pete Amor (59) and Terry Strong (55) Burbage closed at 186-5. Nick Cook 3-39 in 15 overs.
Pete Harris (58 not out) and Dave Tenna (42) then steered Buscot to a five wicket win with an over to spare.
Urchfont gained a comfortable seven wicket win at home to Beanacre who look doomed. Beanacre made 125-8, thanks almost entirely to Stuart Wakely's 91 not out, as Wade Williams took 6-34. Steve Fortune (31) and Mark Bateman then steered Urchfont to victory.
Swindon Civil Service entertained Sutton Veny and bowled them out for 100, despite a fighting 56 from Rob Robson. Nick Money took 4-13 in seven overs and Andy Mildenhall 4-13 in seven-and-a-half doing the damage.
It needed a patient 43 not out from Michael Giddings to finally see the Civil service to a four wicket win with six overs left.
Division Three
Avebury look almost home as Divisional Champions following their 105 run win over Lambourn.
Thanks to Rob Gater (94) and Andrew Blake (25) they totalled 176-5 as Paul Annetts bowled a tight spell to finish with 2-20 in his 15 overs.
Peter Force-Jones, 4-22 in five overs, and Dominic Fry, 3-28 in 11, and then helped bowl Lambourn out for just 71.
Blunsdon narrowed the gap from third place as they defeated hosts and second placed Wanborough.
With Jewells Beckett (63), John Collins (51 not out) and Chris Hamblin (60 not out) Blunsdon closed on 192-3. Chris then took 3-23 in 12 overs and Mark Wilson 3-35 in 15 as, despite 43 from Nick Stacey, Wanborough were bowled out for 102.
Wroughton Wranglers scored 165-5 with Martin Gregory (51) and Mark McMeekin (39) against bottom placed Highworth. Mike Evans then took 4-15 in 9.1 overs as Highworth were bowled out for 93; Vijay top scoring with 45.
Moredon Royal Oak's run of success continues and they now seem safe. They restricted visiting Heytesbury to 118-8; Richard Jelfs managed 35 whilst Mo Farouk took 3-31 in 13 overs and Phil Morton 2-33 in 15. Mo (26), Mat Evans (24) and Barry Sellar (23 not out) then helped Moredon to a six-wicket victory with twelve overs left.
Cherhill gained some useful points as they overcame visitors Swindon 3rds by eight wickets.
They bowled Swindon out for 114; Alan Biggins 30; Ben Webber 5-33 in 14 overs and Mick Butt 2-19 in seven.
Mick (34 not out) and Mark Gresham (49) then helped knock the runs off in just 15 overs.
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