Yes it is Leinster, someone copied it incorrectly from the original transcript.
Yes there were 2 James Priors born 1841, coincidentally I 'think' one married on my mothers half sisters side, to the Laughtons as you mentioned.
You stayed in The Bear 25 years ago, well at that time it was THE place to stay, film stars, nobility, etc, anyone who was anyone stopped there.
Your email addy was removed before I had time to make note of it.
Mine is my username at yahoo.com
reagrds
Steve