Recent objections (Phys.Lett. B 637, 156) to the published Zeplin I limit (Astropart. Phys 23, 444) are shown to arise from misunderstandings of the calibration data and procedure, and a misreading of the data in one of the referenced papers.
@article{arxiv.astro-ph/0701859,
title = {Reply to: Critical revision of the ZEPLIN-I sensitivity to WIMP interactions},
author = {N. J. T. Smith and A. S. Murphy and T. J. Sumner},
journal= {arXiv preprint arXiv:astro-ph/0701859},
year = {2008}
}