The marriage did indeed take place on April 5 1828 - at St Mary, Henley, by licence.
The details given on the Oxfordshire FHS CD are:
Francis Freshfield Reynolds of St Peter Port, Guernsey & Julia Wiglesworth of this parish.
The witnesses were: James Brooks, Eliz. Wiglesworth, Ellen Wiglesworth, Ann Wiglesworth.
Unfortunately, it doesn't say whether they were single or widowed at the time, nor does it give any ages, but perhaps the licence would if you could get hold of a copy (best to try Oxfordshire Archives for that, I think).
However, it does say 'with the consent of Richard Reynolds the natural father.'
Hope that's of some help.
Jill