Hi David,
Yes, the "coverage of this index" is shown at the bottom of this page: www.iomfhs.im/lawsons/LawsonBMD/births/_bir_index.html?Submit=Birth+Index

You can also check the dates overall on the spreadsheet under "Brian Lawson's registered births index" at: lawsonsiom.freevar.com/

By the way, do you have Andreas Radcliffe ancestors?

Sue