If you plan to sell your shares in year (with capital gains of less than £12,300) & / or make less than £2,000 in divdends, then it looks like the basic account is all you need. (Opinion - Not advice)
My view on ISA is two fold:
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Peace of mind, that whatever gains I make is tax free
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Long term investing - I’m not a day trader, and am planning on long term, which means I hope my investments will be worth more than the (current) threshold in years to come. (Bare in mind, the government could & likely will change this threshold at some point).