relegation

(e) at Counties 2 Leagues (formerly Level 8) and below, the following will apply unless otherwise determined by the ROC and agreed by the Committee:
(i) where one League feeds into one higher League: the two highest placed Clubs in the supporting League at the end of the Season will be promoted to the Level above;
(ii) where two Leagues feed into one higher League: the highest placed Club in each of the supporting Leagues at the end of the Season will be promoted to the Level above;
(iii)in respect of all cases, any remaining spaces in the higher league will be determined by at the end of the Season by the Committee by such applicable criteria as notified by the RFU to the Clubs;
(f) the position of the team(s) not eligible for promotion shall be disregarded in the event that a team would be promoted into a League in which another team of the same Club plays, as prohibited by regulation 18.

Relegation
e) Counties Leagues and below (formerly Level 7 and below): the number of Clubs relegated will vary and be determined by the Committee based on such number of Constituent Body based leagues and notified by the Regional Divisional Committees to the Clubs so that after promotion has taken place in accordance with these regulations, the requisite number of Clubs or teams shall be relegated
at the end of the Season so that in the following season there are in all Leagues at Counties Leagues and below the same number of Clubs or teams as in the Season before or such other number of Clubs or teams as the Committee may decide;

Camquin wrote: Promotion (c) National 2 League to Regional 2 League inclusive (formerly Levels 4 to 6): the highest placed Club in each League will be promoted to the Level above; (d) Counties Leagues (formerly Level 7 and below), the highest placed Club in each League will be promoted to the Level above, save that Lower XVs are not eligible for promotion out of Counties 1;. Any remaining spaces in the higher league that are needed to be populated will be determined at the end of the season by the Committee (in consultation with Regional Organising Committees) by such applicable criteria as notified by the RFU to the Clubs; (e) at Counties 2 Leagues (formerly Level 8) and below, the following will apply unless otherwise determined by the ROC and agreed by the Committee: (i) where one League feeds into one higher League: the two highest placed Clubs in the supporting League at the end of the Season will be promoted to the Level above; (ii) where two Leagues feed into one higher League: the highest placed Club in each of the supporting Leagues at the end of the Season will be promoted to the Level above; (iii)in respect of all cases, any remaining spaces in the higher league will be determined by at the end of the Season by the Committee by such applicable criteria as notified by the RFU to the Clubs; (f) the position of the team(s) not eligible for promotion shall be disregarded in the event that a team would be promoted into a League in which another team of the same Club plays, as prohibited by regulation 18. Relegation d) National League 2 to Regional 2 inclusive (formerly Levels 4 to 6): the bottom two (2) Clubs in each League will be relegated, with Clubs relegated from Regional 2 returning to their respective Constituent Body Counties Leagues, unless other determined by the ROC and approved by the Committee; e) Counties Leagues and below (formerly Level 7 and below): the number of Clubs relegated will vary and be determined by the Committee based on such number of Constituent Body based leagues and notified by the Regional Divisional Committees to the Clubs so that after promotion has taken place in accordance with these regulations, the requisite number of Clubs or teams shall be relegated at the end of the Season so that in the following season there are in all Leagues at Counties Leagues and below the same number of Clubs or teams as in the Season before or such other number of Clubs or teams as the Committee may decide; f) Counties Leagues and below (formerly Level 7 and below): if a first XV is relegated into a League in which the Lower XV from the same Club plays, that Lower XV shall automatically be relegated as one of the requisite number of Clubs to be relegated.

Camquin, thanks for clarification- I asked a week or so ago but only got speculation.

Unless a 2nd XV wins the league. So it can be more than 6. And there are many weasel words in there.