Extract from:
http://www.forthports.co.uk/ports/up...Directions.pdf
7. Forth Ports PLC, in exercise of their powers under Section 3 of the Forth Ports Order 1980 and having carried out the consultations required by that section, has given the following general direction to vessels navigating in the port.
Without prejudice to any other obligation to navigate with due care and at a moderate speed, merchant or other private power-driven vessels when navigating the waters of the port shall (except for such purpose and subject to such conditions as may be specified in a licence in writing given by the Chief Harbour Master) observe the following speed restrictions when West of meridian 3º 16' west:
a) When East of the Forth Railway Bridge:
i) Vessels of 100 metres or more in length overall – 12 knots over the ground
ii) Vessels less than 100 metres in length overall – 15 knots over the ground
b) When West of the Forth Railway Bridge:
All vessels – 12 knots over the ground
The imposition of a strict speed limit of 10 knots over the groundwhen passing within 5 cables of a ship lying alongside Crombie Jettyor Hound Point Terminal, or when passing within 5 cables of avessel at anchor or moored to a buoy.
About 5 mins later the spark advance stop screw locknut let go after I throttled back to phtoograph a passing seal, 5 mins after that the spark advanced far enough to knock metal off the corner of the pistons, and the Aux got it's first good run of the season...... 
.. maybe if you turned the bass down a bit and put some carpenters on instead of that 50 cent rubbish .. he might have left you .. or maybe he thought the angle grinder in your pocket was a pistol 
