Free resources for download
Vinson, D. P., Cormier, K., Denmark, T., Schembri, A., & Vigliocco, G. (2008)
The following files with the ratings can be found in the archive folder "A-D":
*Ratings are not the age at which a native BSL learner would be expected to have learnt a given sign - these estimates are based on a variety of signers, not all native - so they are best thought of as an estimate of the order in which signs may be learnt. (Lower values = learnt earlier).
Vinson, D. P., Cormier, K., Denmark, T., Schembri, A., & Vigliocco, G. (2008). The British Sign Language (BSL) norms for age of acquisition, familiarity, and iconicity. Behavior Research Methods, 40(4), 1079-1087.