So, I sent off two 120 TriX films to AG Photolab on 17 March for process and scan, via their freepost label. Ordered on the web prior. Got an email the next day that they had received it:
Note this was a Friday, so presumably an extra 2 days might figure. On Tuesday 22nd an email told me the order was despatched, and it arrived the next day, 6 days after posting.
The negatives are in clear sleeves, no filing holes, so I had to fold their sleeves and put them in another sleeve to file them. I haven't had enough 120 to know what the best sleeving solution for 6*6 is yet.
I ordered the medium scans (small scans only saved £1 each). The files seem to be a maximum of 2079*2048 pixels (4.3 mp). That would be 924 ppi if the larger pixel count were the full 2.25 inches. (The order confirmation says medium scan ~18MB, which would translate to a 6 mp image, or about 2500pixels square). To my mind that's the minimum I'd want for flexible use, and on that basis it felt quite expensive at £20.86 for two. However, taking outwards postage into account it was the cheapest of those I have in the nifty price estimator. The scans look fine.
Quick comparison... UKFL's small size for 645 is: 2433 x 3342 pixels (8″x10″ when printed). Peak Imaging indicates their small size is suitable for 5*5" prints, presumably 1500*1500 pixels, while the medium size (CD Archive 120 Gold) is suitable for 10*10" prints, presumably 3000*3000 pixels. Photo Hippo (fairly similar price to AG) say their medium scan is 4547*3047 pixels, presumably for 645 negatives (it's not quite clear). Club 35 say: Standard Resolution CD [small] (1536x1024), Super Resolution CD [medium] (3072x2048), again presumably 645.
Against these comparison, I feel that AG's medium scan is on the small size, and on this basis I would probably not use them again. Everything else was fine, though. Communications definitely a step up from pearlier experiences,