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I think your main concern is just pipe diameters and sensible routing. Remember that every T and elbow adds an equivalent length of pipe which reduces flow rate.
Seemed to go OK, the toilet cistern flow needs to be reduced because it fills up so quick the overflow may not cope but other than that. I hope the price of scrap copper and lead is decent at the moment.
I would deffo dig up your drive and replace the complete pipe, hopefully it's a shallow weak concrete mix. If you're diy a sledge hammer and massive pick axe would be useful but don't knick the pipe!
inchpincher
I think your main concern is just pipe diameters and sensible routing. Remember that every T and elbow adds an equivalent length of pipe which reduces flow rate.