British Gymnastics:
British Gymnastics – information about membership and insurance, as well as other gymnastics-related things.

NDP:
This link shows a PDF of the National Development Programme (all the pairs and groups skills.

Range and Conditioning:
This link shows a video of the ‘Range and Conditioning’ needed for tumbling competitions.

Leotards
A Star Leotards

Suggestions for appropriate yoga mats or similar:

Ikea green folding mat: £22.00

https://www.ikea.com/gb/en/p/plufsig-folding-gym-mat-green-10262831/

Amazon folding thick mat: £28.99