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@Airhead
You could have them surveyed first. That way you can find out what's going on there wherever the problem is. If you've got a blockage it could be anywhere, as you don't know the layout of the drains yet you can't really tell what's going on whether it's blocked or just restricted. I could give you examples of problems I've seen where the blockage is in the street pit but it's too soon after my lunch.
I think it's cost us circa £120 in the past for a survey but they will tend to clear any small blockage they find while they're poking the camera around. I think they can't go round the u bend so the toilet has to come off or some access hatch opened.