are there any slipways on the grand union canal ?

[Captain Coochie]

With parking .
edit : Public slipways that is .

 

[ladyhamilton]

Best bet is to ring British waterways, there were 2 one at Gayton and one at Stoke Bruerne but they were restricted access last time I looked. There is one at Milton Keynes Marina but it is £25 for usage.

 

[apollo]

Try Uxbridge Boat Centre

 

[BarryH]

Willow Tree marina on the Paddington Arm just off the 312 by the new Tesco's, about 15 mins from your place.