2009-12: Try scoring prominence
The 2009–10 season would see Allen to start to demonstrate the prolific try scoring form that would characterise his later career at Blackheath. While the previous year had only seen him score 3 league tries all season, he had already eclipsed this figure in his first four games of the new campaign in National League 1 (formerly National 2), including his first ever club hat-trick as his team hammered Manchester 82–0 at home. Allen's form continued throughout the season, contributing 17 tries from just 21 league appearances, including braces against Otley, Manchester and Redruth, as Blackheath finished in 8th place. 2010-11 would follow in much the same vein as Allen scored another 17 tries to finish as Blackheath's top try scorer that year - a figure which included early season hat-tricks against Stourbridge and Macclesfield - as Blackheath improved to 6th place. This prolific scoring form saw Allen return to the England Counties fold, gaining his fifth cap on 18 March 2011, as Counties went down 8–16 to an Irish Club XV in Dublin.
The 2011–12 season was to be Allen's most prolific of his senior career. While in previous seasons he tended to score in batches, this campaign he was consistent throughout, and would finish as Blackheath's top try scorer (and joint third in the division tied with Nick Royle) with 25 tries as Blackheath finished in an impressive third in what was a very competitive National League 1 that featured the likes of Jersey and Ealing Trailfinders. Allen's 25 tries featured a hat-trick against Barking along with braces against seven other sides. Unsurprisingly he was also recalled by England Counties, featuring in a 34–16 win over an Irish Club XV at Preston on 16 March 2012. After the successes of 2011-12 Blackheath would struggle in National League 1 dropping down to 10th place. Despite his teams change in fortunes, Allen was still prolific, finishing once more as Blackheath's top try scorer, this time with 19 tries - joint fourth in the division. In February 2013, Allen picked the last of his England Counties caps, appearing in the 20 - 30 loss to an Irish Club XV in Cork on the 8th and 27 – 7 win over France Federale in Ealing on the 22nd.
