A strip of block paving about 1.2 m wide and 5 m long has sunk. The dip is about 3 cm deep along the first 3 m and about 4 cm deep along the last 2 m. I need the blocks lifted, the bed re-levelled, and the blocks relaid. The job: Lift the blocks in the sunken area and stack them (I want to reuse them). Check the sub-base underneath. Add sharp sand to bring the bed up to the right level, then screed it flat. Relay the blocks in the existing pattern, flush with the surrounding paving and with no rocking. Compact with a plate compactor, sweep kiln-dried jointing sand into the joints, then compact again. Clear away all waste and leave the area clean. Block paving experience required. Please plan to supply sand, but I'll pay for what is needed as required, so not needed to be included in quote.