Stock Cars have a loophole though as it is a sport where competitors pay to participate. Classed as an amateur Sport and may get permission based on the update by Oliver Dowden last week of participation sports with small crowds.
Local Councils will approve on that basis but Government has yet to confirm what % or number Crowd can be.
It's possible crowd may only be friends and families of drivers.
It seems that Dog Tracks are guarding "betting levy turnover" and understandably as that's majority of any income. If a speedway event with a few hundred people delivers a positive test the Stadium is automatically closed for 7-14 days and some Dog Tracks have 4-5 meetings a week. That would be very negative for Wolverhampton, Birmingham, Kent; Sheffield, Newcastle (as we have seen); Swindon chances. The Dogs have not restarted at Poole as the Stadium staff are all on furlough still.
The best hope currently seems to be the Stock Car venues although Speedway is classed in a different category to Stocks as payment is made it's considered "professional" but may be good news for King Lynn, Ipswich ; Scunthorpe, Mildenhall and Eastbourne who stage Stock Car Meetings.
The "standalone" Speedway Tracks like Berwick, Edinburgh, Redcar, Leicester, Belle Vue, Somerset; Plymouth, Peterborough , IOW will have to decide whether it's viable to open for speedway alone or with other stadium uses to cover their costs.