airhumberside you are correct, having checked the Thomson website the Bristol to Boa Vista flight is the only one from the UK on a Tuesday.
I would guess it will now depend on forward bookings as to whether this remains a stand alone flight from Bristol or if it gets merged with another UK flight!
Lets hope there is sufficient demand to obtain a decent load factor on a 757!
Only time will tell, but like you say Thomson seem to be making a push on this destination for W11/12, maybe this is due to the recent trouble in Tunisia and Eygpt trying to persude holidaymakers to try somewhere different!