I can't get onto them as my old iTunes account is locked.
See -> If your Apple ID is locked or disabled -> If your Apple ID is locked or disabled - Apple Support (CA)
-> Get a verification code and sign in with two-factor authentication
Get a verification code and sign in with two-factor authentication - Apple Support
Also I have a new number so I can't get a verification text.
Sign in to your Apple ID account page and edit / update your Apple ID details.
https://appleid.apple.com
-> edit your new trusted phone number.
Also I don't have access to my old email address.
1.
It depends on what you did with your 'old email address'. If you have deleted it, it is no longer valid, it simply no longer exists and it no longer works.
To understand about a deleted email address, see the Apple articles below:
How to delete your Apple ID account
How to delete your Apple ID account – Apple Support (UK)
Understand and control the personal information that you store with Apple
Understand and control the personal information that you store with Apple - Apple Support
2.
If you stil have / know that old email address, check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID
If you forgot your Apple ID email address or phone number - Apple Support
OR see -> Having trouble signing in?
https://iforgot.apple.com/password/verify/appleid
Try this -> If you can't connect or sign in to iCloud
If you can't connect or sign in to iCloud - Apple Support
See also -> Contact Apple for help with Apple ID account security
Contact Apple for help with Apple ID account security - Apple Support