Rights in perpetuity which had compulsorily purchased for the construction of road bridges over riverbed, soil and airspace adjacent to the A13 were valued by the Lands Tribunal at a nominal £50 because it was not possible to rely on comparables which were either river works license settlements under s 67 of the Port of London Act 1968 or compulsory purchase compensation settlements under s 5 of the Land Compensation Act 1961 that may have been settled be convention on the basis of earlier s 567 settlements because there were material distinctions between the assumptions to be made under s 67 and s 5, and the special suitability for construction of the bridges must be disregarded under s 5 (r) 3 and there was no demand r market for the subject rights in a no scheme world.