Finely Potted Earthenware Bowl with Celadon Glaze & Incised Signature

Came acorss this very finely potted bowl today with a lovely celadon type glaze and an incised signature to the base, not sure how it reads and having scrolled through all the incised marks on the BISPM website I can't see a match. Wondering if anyone recognises the signature?

Looks like Heele 86. or maybe J Heele 86.

That's how I read it as well Denby but the only Heele I can find any reference to being a potter is a French artist Marianne Heele and assuming that the 86 is a date it completely rules her out.