The Bath Half is a good course to attempt your PB.  It is a 2 loop, mainly flat course with the last mile being up a slight incline (sadly!).  I did my PB 1:49:13

It is a large race as about 12,000 people enter and it is quite expensive, the plus side being that the support is amazing and you get cheered the whole way round!
I would recommend it…especially as Bath is such a lovely City….

Please don’t mix the race up with the Bath Hilly Half as you may get a shock!