Hello Martin,
Did you also notice the following in the IGI:
Sarah BOOTH, christened 10 Oct 1816 Wilton Roxburgh Scotland, parents Thomas BOOTH and Betty JAMIESON.
Does Sarah appear in any of your later records in Yorkshire? That might help confirm that you have the right marriage.
Also, interestingly(?), there's a birth of a Thomas SCOTT, 4 May 1813 Wilton Roxburgh Scotland, parents William SCOTT and Betty JAMIESON; perhaps this is the same Betty having a child before she married Thomas BOOTH ...
It is impossible to know in advance what will appear in an entry in a church register - I've had ones which have nothing more than appears in the IGI but have also had very imformative entries. So who knows - the entries might say nothing more than the IGI but, on the other hand, might even mention where Thomas comes from and his occupation ...
If you live near an LDS Family History Centre - you can search for locations of these at
http://www.familysearch.org- then ordering in the film(s) of the particular church register to consult at the FHC is a much cheaper option than purchasing copies of entries from GROS; added to which you might come across other entries of interest when you have the film(s) in front of you.
Good luck,
JAP
PS: There is some good information about Scottish research in the posts at the top of the Scotland General board. A couple which are very useful are Boongie Pam's posts at:
http://www.rootschat.com/forum/index.php/topic,24468.0.html