Chris, church weddings were pretty unheard of in those days
More of a 20th Century thing that crept in over time. This is a great site if you are interested in reading up on the history of civil registration in Scotland and social history
www.rootschat.com/forum/index.php?topic=578172.0 The period you are looking at now is pre 1855, but a fascinating read regardless. Will be interesting and more relevant for the later research you have.
In those times, it was very common to marry in the bride's home or the local Manse. It may be that Elizabeth's family home was not the location (we still have issues don't we due to not being able to fully confirm either WP or ED's parentage with anything more than Family Search so far).
Where is the reference to Dad William being just to the east in Pleaknowe. I can see I think William Snr and wife Jean with children here in 1841
www.maxwellancestry.com/census/41transcript.aspx?houseid=78506001 The look to have still been there in 1851. Phaup seems to also have been known as Fawhope...with once again a lovely sheepfold nearby!
www.rootschat.com/links/019b1/ - link shrunk from NLS maps site (great maps aren't they
).
Monica
Added: 1851 entry here
www.maxwellancestry.com/census/51transcript.aspx?houseid=80901003