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Just reporting the facts - when you employ a professional you expect a fast and efficient service: I received neither.
No, I wouldn't expect a discount from two independent instructions, but by pooling our custom I would expect a certain amount of economies of scale to take effect.
Oh and trust me, it felt like a had to do my own conveyancing, so much so that I found out there was a possible Chancel liability on my current house - not my solicitor: professional negligence.