I have now set in my PBP code, @ DEVICE pic16F628, MCLR_ON
This still doesn't allow chip to reset properly, only whilst MCLR is held low does PIN1 stay LOW. If I remove the 5V power completely it does reset OK.
I do apologise for being a nuisance, I think I have slowed down a bit in recent years, there's a clue to my age in my username.
Rgds
Mike