This is very like what I did last year by moving money around my normal current A/C, a TSB A/C, an M&S current A/C and an M&S savings A/C. I made nowhere near 6.8% on it though, so I mean to try this in the next few days.
Note that the writer says that each customer is allowed two of the TSB accounts which pay 5%. Not exactly - one has to be a sole A/C and one a joint A/C so it is really one and a half accounts each.
www.telegraph.co.uk/finance/personalfinance/savings/10706195/How-to-earn-6.8-on-your-cash-Isa-this-year.html
Baby Reindeer - anyone watched it?