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2 x Santander 123 accounts? one sole - one joint.
Will be 1.5% for the whole 40k
Do you have a partner you trust? I'd go further and try and pick up a few of the smaller accounts as well like TSB and Nationwide - could give you almost £10k @ 5%. You might not think it's figure it's worth the hassle, but I found TSB very quick.
See here: http://www.moneysavingexpert.com/savings/savings-accounts-best-interest
If you're going to need it in 6 months I think it would be unwise to do anything other than vanilla bank accounts.
Or sell it all and buy Sterling while it's cheap. Oh wait...
I have about £40k which, in about 6 months time, will be used for a loft conversion. It's currently sat in my bank earning about 0.5% interest. Any suggestions on what to do with it for the next 6 months?