Thank you for the offer.
I managed to extricate it!
I bought a pair of VERY long nosed plies for £8.95. I ground down the business end to form a VERY thin nose to a length of about 3". I heated the end and used my van tow ball as an anvil, and hammered the end of the "nose" to create a sharp bend .
The dipstick had wedged under the dipstick oil seal, so had to use a kebab skewer to rise it from under the ridge.
I then inserted the pliers and, working "blind" but having observed the position of the stick opened them as wide as the tube would allow, and slid the bent nose over the stick. Closed the pliers to grab, and withdrew. A few attempts, and it was out.
Thanks for all the comments.
Are all new dipsticks pretty much the same, or should I buy a "genuine" one?
Thanks again