Proper money question

Where should I put £1/4M where I have instant/penalty-less access?

Happily and assuming that you do not want to take investment risk Santander answered this q for you yesterday by launching a 5.2% instant access account for up to exactly £250k.  What a happy coincidence.

Last time I tried to send £100k to Santander from a client account they panicked and the money got sent to a special holding account that no-one in the branch knew how to get at. A right mess with me being accused of theft! 

That Santander a/c sounds like it fits the brief. Maybe 50k a head into premium bonds if the "dead" time getting in and out isn't too high a proportion of the overall holding time, and if you have a high marginal tax rate.

Much obliged to all.

By the way, since this is ROF, I should have made it clear the the ‘proper’ in the title refers to the question, not the mere bagatelle that is the sum of £250k…