Carl. It was in the summer MB special. It was only part of an article, (which I MAY have written…) and not a specific "how to " job. Good article of course, actually contains hints and tips and my "modus operandi" and so on.
Basically, the options are….waders, and using a long extendable fishing pole with a wire hook on the end,
a fishing rod to cast a weight over the stricken vessel (SV) to drag it back, or a ball of string with a small weight on which you throw over the SV. .
A boat to push the SV in (needs a flattish front and preferably a grippy rubber/foam bumper….we find the small landing craft to be good for this, something you can knock up very cheaply…(.see my album)
Using another boat to tow a long bit of string with a float on the end. The boat goes round and round the SV and the string slips under the SV and gets caught on the prop, and then you tow it back in.
No doubt the more tech savvy boaters may suggest using a drone to carry a line over and hook the SV and either towing it itself or bringing back the string to be pulled from the bank……
Ashley