Is an accountant necessary?

Hi there,
I am wondering whether an accountant is necessary for a tier 1 investor, or is it possible to handle all tax matters personaly.
In particular, initial setup with the revenue and tax returns for the required investment in gilts and stocks. No other local or foreign income.
Any advice would be much appreciated.
Thanks,
Owen

Accountant is always advisable when dealing with issues involving huge sums of money