Hi,
Thanks for your reply.
Maximum memory Wordfence can use: 256mb
memory_limit 128M 128M
Wordfence Memory benchmarking utility version 4.0.3.
This utility tests if your WordPress host respects the maximum memory configured
in their php.ini file, or if they are using other methods to limit your access to memory.
--Starting test--
Current maximum memory configured in php.ini: 128M
Current memory usage: 42.75M
Setting max memory to 90M.
Starting memory benchmark. Seeing an error after this line is not unusual. Read the error carefully
to determine how much memory your host allows. We have requested 90 megabytes.
Completing test after benchmarking up to 80.25 megabytes.
--Test complete.--
Congratulations, your web host allows you to use at least 80.25 megabytes of memory for each PHP process hosting your WordPress site.
I've activated all required plugins and get the same result - when WF is also activated.
There's obviously an issue somewhere along the lines so it looks like WF is out for this project, unfortunately.