I stayed at 'Anela' B&B for both brush-ups. Very comfortable rooms with TV, en-suite + good shower, tea and coffee etc.
Best breakfast I've ever had from a B&B, and well priced, from £17.50 per night.
Tina and Howard are lovely people and will make you very comfortable / allow you to concentrate on getting the homework done. I have heard of a few other places (no names) with a somewhat 'Gulag' atmosphere.
There were a few others there for my last stay, and we all felt the same, so maybe they will add their recommendation as well....
Lastly, Anela is 10-15 minutes walk from the BGS building, and also very close to the centre of town.
Tina is contactable on (01934) 743 806
Best of luck & I hope you enjoy the brushup.