Jools is in Soi Nana, about 200m further down than Nana Plaza. It has friendly staff, management and regular clientele who make newcomers most welcome. It is a small narrow bar and can be very crowded at peak times, which in a way adds to the Pub atmosphere. Very reasonable bar prices.
It has an incredible menu of Pub ‘grub’, every dish I’ve tried has been authentic and delicious.
If you are looking for a friendly, small Pub as distinct from the larger empty ‘barns’ that are now too common in Bangkok you will probably enjoy Jools.