As has often been stated, āOne big leagueā in the UK would actually mean a maximum of eight teams featuring the best available riders (full time professionals) coincidentally the same number as Polands top flight leaving all other promotions to operate on a semi-pro basis providing rider development opportunities. No other formula is reasonably possible given the quality of rider availability and cost.
Top league of eight - Belle Vue. Kings Lynn, Leicester, Northampton, Ipswich, from current Premier league plus three from Scunthorpe, Oxford, Poole & Glasgow.
All of the above have sufficient availability of stadium to run on Monday or Thursday with sufficient capacity of at least 2.5k which are two of the necessary fundamentals as a means to attract a significant TV deal, halt the decline & provide a basis for growth.