The bottom line of course is does the site have an ATZ ?
No it's not. The rules of the air require pilots to either remain clear of, or conform to, the traffic pattern at all airfields regardless of whether they have an ATZ.
The CAA has highlighted this recently in relation to the many airfields that are no longer licensed but still active.
The traffic pattern of a winch launch glider site can extend to the maximum authorised launch height at that site.
Regarding lookout - there is a greater onus on the power pilot to look out because he/she is required to give way to gliders. (That should get a few responses!)