Thanks for the comments.
Not 100% sure which way to go with these domains.
We used to supply eye test booking leads for two of the UK's biggest opticians a few years ago. This was done via custom built landing pages and then traffic sent from a number of sources. This worked very well.
Sadly the budget from these guys ran out.
We are looking into our options at the moment.
We will either build a new site and promote it with the view of working direct with opticians, or look to exit and sell the domains.