As you may know greater data protection rules will be coming into place in late May this year. This may well require each and every one of the members of the league signing some paperwork to acknowledge the data which is currently held on you by the League on behalf of TTE. Currently this definitely includes name, address, dob and nationality (this is the bare minimum to get registered with TTE). You might also have declared your phone number, e mail and ethnicity.
So if you suddenly receive a consent form then please sign it and return asap.