Firstly, thanx for all the info on 4x4 post fixings, much appreciated.
Wondered if anyone can help on next part
Pergula is still in its "design stage" and dimensions are dictated by my house wall and neighbours  boundary garage wall. No iwill not be fixing onto the garage!!!
Pergula will be 8' by 6', and 7'3" high (7'3" dictated by garage height as its a little below my ground level, and want to keep symmetary).
as i said, the actual "look" of the structure is sorted, but i am unsure what size rafters and bearers to fit, bearing in mind the 4x4 uprights.(want it to look sustantial), should i use 4"x2" or 6"x2" treated timber, and also, can i buy these in 10' lengths, sorry 3m lengths. I still use old money!!
thanx in advance
mick

i agree with jerry about the chunky looks

might also be worth scaleing the size down by 3" [width and length]this may allow more ecenomic use of lenghts of timbers as 10ft is 2"more than 3m and obviously 2.4m is nearly 2" less than 8ft