We went a few years ago - one of the first, I think - and usually manage to get to the safety evenings when around MAN, usually organised by Chris Walsh, who also does some of the tours.
Tried again both this time and the time before, without success. Might be the last one at the old (i.e., the 2nd) tower, as the new one can't be far off completion, now.
A very interesting and worthwhile experience, which confirms what we have known for years, that most ATCOs at MAN are very much pro GA. Our group is now the sole surviving GA aircaft based there...
Enjoy the visit!