By Ali Lyon Property developer Watkin Jones has warned investors that a “slower than expected” summer market and “uncertainty” over the pace of interest rate cuts will weigh on its full year results, as it lowered profit guidance. In a trading update, the Aim-listed firm, which in its half-year results in May returned to profit thanks to a £4m jump in revenue, conceded that it is now unlikely to complete any further deals before the end of its current reporting period at the end of September. Watkin Jones lowered its profit guidance to between £10m and £12m this financial year, while gross cas…