Hi 'scaley',
Try Green's of Morpeth (beside the railway station). I bought a flat tinned fork there a couple of years ago (cost about £20.00 then). Don't know if they still sell them, but they are brilliant for digging lugworm. The tines are very flat; however I don't think the shafts are the strongest - although mine has lasted over two years so far, but I don't but excessive force on it when I'm digging. Don't know where you live, but if Morpeth is a fair way from you, then why not ring them to see if they have them in stock. Sorry I haven't got their number, but they will probabaly be under 'country clothing and stockist' or something like that as they mainly deal with outdoor clothing and footwear for walking etc.
Hope this helps................BAZACODBASHA