It was announced, on 6 March 2015, that Bowtell had signed for the Rye House Raiders for his debut season in the National League. By the end of the season he had progressed out of the reserve and moved into the number 2 position, increasing his average from 3.00 to 3.95. Bowtell moved to Mildenhall Fen Tigers for the 2016 National League season. He maintained his position at number 2 throughout the season and increased his average to 4.21 by the end of the season.
2017 season
Lakeside
On 12 December, Bowtell was announced as one of Lakeside Hammers' first signings after they dropped down to the National League from the top flight. He helped Lakeside finish 4th in the league. During the season Bowtell formed a strong middle order partnership with Paul Hurry; this helped him improve his average to 6.65.
Newcastle
Bowtell signed for Newcastle Diamonds in the SGB Championship on 4 July; he came into the side at reserve to replace Dan Greenwood. He had improved his starting average of 2.00 to 2.19 by the end of the season.
2018 season
Championship
Originally, Bowtell had no team. However, Lakeside were forced to change their initial plans due to a mix up of averages, so he came into the side in place of Max Clegg. This was Bowtell's second consecutive season with Lakeside, and it allowed him to progress with them as they moved up to the SGB Championship for the 2018 season. Bowtell yet again improved his average, although by a small amount, to 2.38 at the end of the season.
National League
For the 2018 season Cradley ran a team that only competed in the National Trophy. Bowtell signed for them on 13 May as a replacement for the injured Jordan Jenkins. He helped the Heathens finish top of the North group taking them to the final against Mildenhall Fen Tigers. Cradley finished as runners-up with the final finishing with an aggregate score of 80-100 in favour of Mildenhall. After an impressive start to the season with Lakeside and Cradley, Isle of Wight Warriors signed Bowtell on 11 June to replace Ben Hopwood who had put in a transfer request to the National League side. To begin with he started off in the number 5 position, however at the beginning of August he took the number 1 position from very experienced National League rider Ben Morley, he remained at number 1 for the rest of the season. On 30 September, he represented Isle of Wight in the National League Rider's Championship. He finished the meeting with 14 points, leaving him level with Isle of Wight team-mate Morley, this led to a run-off which Morley won meaning Bowtell finished as runner-up. His time with the Isle of Wight helped him improve massively with him finishing the season with an average of 9.28.
2019 season
Bowtell joined Eastbourne Eagles on 6 December 2018, with them moving up to the SGB Championship in 2019. He completed the season with an official average of 3.1.
2020 season
brought in Alfie Bowtell as their new #1 rider in advance of the 2020 National League season.
