u/Turkish-Turnip

My grandfather has recently told me he has over £250k in a single savings account that pays 3.9% on anything up to £50k and anything above that gets only 1.01%!

Besides moving £20k per year into an ISA, what is the most tax efficient way for him to get more from his money? He owns a company and currently pays himself £12,570 per year as a salary. He is looking to sell the business within the next 2-3 years, so is a SIPP a possibility?