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Andrew has decided, in his infinite wisdom, that the answer is to be towed/snatched off. That is his call so his OP only asked if there was anyone passing that would be prepared to try. That there are many good ideas here I do not doubt, but, as with many posters, they do not suit the answer which has already been decided. N

I envisage a scenario where he takes all the bicks and bricks out of the bilge to the spillway, walks back and the boat has floated away out of reach.

What puzzles me in this thread is the way the OP steadfastly dismisses all proposed solutions due to the unusual location, whilst at the same time refusing to allow photos of said odd-sounding situation to be posted. With a photo, the problem might be better understood and a practical solution developed.

You already mentioned the answer to your release in a previous post. Wander down to the spillway with your plank, mallet and maybe a couple of wedges. Use the plank to raise the spillway dam height thereby raising the pound level temporarily. Rain this evening or Saturday morning is expected, or maybe the bywashes are running anyway?? (Hopefully assuming there isnt another overflow on the pound.

Any liveaboards on the Brecon and Monmouth Canal who continually cruise?

It's not sur;prising it is leaking there with that great big red arrow stuck into it.

Yep. Back in the day when my cars leaked excessively, it was time to scrap them or sell them on. I remember my wife driving really fast in my 1968 Mini through a road flood and passenger getting utterly soaked from the fountain through the rust holes in the floor.

I've just spent the last couple on days working on a narrowboat that was in the early throes of the sticky diesel phenomenon: bad enough to stop the engine and prevent a restart but not, I'm delighted to say, so far advanced that the pump and injectors had been damaged. A couple of takeaways from earlier parts of this thread that I would endorse are that a) beef dripping is a quite brilliant description (if you are of a certain age) – see pic and b) diesel and petrol are excellent go-to solvents, certainly in the early stages of the problem. It was the usual story of the fuel having been in the tank for a year or more and a significant drop in temperature heralding a Scottish winter. The worst manifestation of the problem was in the water separator filter (an ideal breeding ground with its very own wee fuel/water interface – and suffering from totally neglect in this instance) and from there it had clearly migrated along the fuel lines to the engine filter, the electric feed pump and the line as far as the common rail, this being an Isuzu engine. The picture shows the water separator filter and the two components of the gunge on the filter and in the bowl are beef dripping poured into a pot to cool to a T! On removing the 'beef' bit there was evidence of a hard material forming a glaze in the bottom of the bowl and my concern was that something very similar might have been going on with the internals of the common rail or the insides of the injectors. Fortunately, once we'd removed all the fuel, cleaned the tank, fuel lines, filters and electric feed pump (which was badly clogged and needed to be removed and shown the airline) and then treated the new fuel with Marine 16 at shock treatment concentration levels+ (if it's good enough for the RNLI it's good enough for me) the engine was prepared to fire up and for the last couple of hours has been running as sweet as a nut. The boat is now undertaking the two hour night time run that was forcibly postponed from Thursday evening. I suspect that if the owner had come to the boat in, say, a month's time it could have been a very different story and an expensive trip to a diesel specialist with CR pump and injectors. Needless to say, the owner will now change his filters regularly, and drain off the water at frequent intervals. He's already ordered his own supply of Marine 16 and is even talking of popping down to the Scottish Canals diesel pump to top up with HVO which, much to everyones surprise, is now SC's preferred fuel for their own vehicles, plant and equipment and they are also selling it to boaters. Me, I shall stick with HVO and husband it with great care in the hope that it eventually returns to the £0.88/litre price it was a year or so ago when I bought it. Currently purchased retail from SC, it's getting up towards 3x that price and I know from a conversation with their buyer yesterday that they are only marking it up by £0.11/litre. Sticky Diesel Image:beef dripping.docx

The answer (and a very simple one at that) has been posted by Matty very early on in this thread and for some reason ignored. Raise the water level in the pound.

I'm intrigued ! What is the artefact ?

We don’t know which pound he is on but it’s likely to be a S&W wier which is circular possibly fan shaped in the middle of water so hard to brick which is why I suggested blocking the hole into the weir area. it is somewhat unusual all in all I agree with MtB. Can the water level have risen so much then drained off, those by washes are very efficient and need to be. Blocking off a refloating is best I suspect to reverse what originally happened

Nah! Suella Braverman got there first. Apologies to OP

Stop eating beef dripping sandwiches whilst ploughing

Lots of rain again in the morning, that's how you got there, try the plank method, if you dont, don't bother to ask again.

It wasn’t rolled tightly enough

Has to be worth the trip to Debdale, climate controlled. They're the leaders in this. Lovely cruising ground and scenery. 56 hrs from Uxbridge on canalplan.