Hi Waco,
If you're still after a flat tined fork for lugworm, you could try Green's Country shop in Morpeth. I bought one a couple of years ago (around £29.99) I think. The handle isn't the strongest, but the 'prongs' are very flat, and perfect for digging lugworm.
The shop is situated beside Morpeth railway station, but I would ring them first, if you were thinking about buying one, to check if they have any in stock, as I know you live in South Shields.
Cheers.