I promised to let you know the solution so here goes:
Thanks to Ian Kinner at digium support for this.
A Mandrake 10.0 system (I think this is the problem)
Zaptel compiled O.K but the module could not be found, despite the fact it was in the correct place /lib/modules/‘uname-r’/extra/zaptel.ko where ‘uname-r’ is your kernel. (Ian Kinner pointed out that it could be misc instead of extra).
Ian Kinner suggested removing the modules, then make clean and recompile, then depmod -a and try again. It didn’t work. So then do /sbin/insmod /lib/modules/‘uname -r’/extra/zaptel.ko . It worked! I had to do the same for wctdm.ko and finally the lights appeared on the TDM card.
Perhaps this is something that could appear in a FAQ or in the Documentation somehow?