Recommended bookshops in Bristol

This group is in danger of going dormant, having gone two months without a message, so how about an enquiry to keep the wolf from the door:

My daughter is in danger of taking a job at Southmead Hospital, Bristol, and I am in danger of being her chauffeur on a reconnaissance trip in the next week or so. Can anyone suggest a bookshop that I really ought to visit in north Bristol, or between there and either of the Severn bridges? Otherwise I shall have to make Hay-on-Wye a "tea-break" (read "bookshop or three") on my way home. Cheers.