He would better sell the films with an Andec processing coupon which would save on labour and gives users a faster turnaround. But indeed higher shipping costs per film (from UK)
It must be getting on 10 years ago since I had anything to do with Blue Cinetech, but that is precisely what they used to do: You'd buy the film from them 'process paid', which was shipped very promptly. When it arrived you found an Andec processing voucher included, so when the film was exposed you'd ship it directly to Andec yourself with the vouncher. They would then process according to their normal weekly schedules and post it back to you.
Depending exactly what day you posted the film off and whether or not it arrived in time at Andec, you might get the developed film returned within 7 days, else it might be within 14 days.