The 1975 New National League was contested as the second division/tier of Speedway in the United Kingdom when British League Division Two was renamed. It was subsequently named the National League. The change came about following unrest between some of the clubs and the speedway authorities in previous seasons.
The league increased by one team for the fourth season in a row, despite the loss of three teams; the Barrow Bombers, Long Eaton Archers and Sunderland Gladiators. Sunderland closed for good but in November 1974, Ian Thomas bought the defunct Sunderland licence and transferred it to re-form the Newcastle Diamonds. Three other new teams entered, in addition to the Newcastle Diamonds and they were Crayford Kestrels (returning for their first season since 1970), while Mildenhall Fen Tigers and Paisley Lions both competed in their inaugural seasons. Paisley would race at a new track constructed around Love Street, home of St Mirren F.C..
Birmingham Brummies, winners of the last British League Division Two, retained their title and were promoted to the British League for 1976. Birmingham won the league by 5 points despite losing their leading rider Phil Herne to Newport in division 1. Birmingham relied heavily on Arthur Browning, Alan Grahame and Keith White, improved performances by Ricky Day and Carl Askew and solid seasons once again from John Hart and George Major.
Newcastle finished runner-up on their return to league action, with the Owen brothers Joe Owen and Tom Owen topping the league averages.
The 1975 National League Knockout Cup was the eighth edition (first under its new name) of the Knockout Cup for tier two teams. Eastbourne Eagles were the winners of the competition.
First round
Second round
Quarter-finals
Semi-finals
First leg
Second leg
Eastbourne were declared Knockout Cup Champions, winning on aggregate 83âÂÂ72.
Laurie Etheridge won the Riders' Championship, held at Wimbledon Stadium on 27 September.
The National League Pairs was held at Hyde Road on 17 May and was won by Newcastle Diamonds.
Semi finals
Final
Berwick
Birmingham
Boston
Bradford
Canterbury
Coatbridge
Crayford
Crewe
Eastbourne
Ellesmere Port
Mildenhall
Newcastle
Paisley
Peterborough
Rye House
Scunthorpe
Stoke
Teesside
Weymouth
Workington