If you want one get them quickly. It will only be a matter of time before TfL get onto Cafe Press and force them to take these down too.
The person who put these up said of the T shirt "Just don't wear it around any of your friends who happen to be TFL lawyers."
There were similar issues with the Tube Relief logo but someone at TfL had actually sanctioned the slight variation of the logo use and the resulting T shirts - probably because we were doing the challenge for the bombing victims.
Thanks to Simon for alerting us to Anagram items in the comments!