thanks for the reply grinder.
i have read that thread and still dont think anyone seems to have a definitive answer to the matter. fwiw i have assessed myself on the second method ie only accounting for closed out/expired/assigned positions and given the net figure to my accountant. all positions which were open at 30 june will be on next years calcs.
if this ever gets queried i will deal with it then, but if i need to defend it it at least has the virtue of being the fairest method, certainly far fairer than paying tax on as yet non existent profits.
village