Selling Aviva Shares

I got a letter from Aviva saying I can sell my shares there. This is a service provided by them until the end of August only. Anyone know what's behind this?

What do you mean "behind it"? Some companies, usually via their registrars, offer small shareholders a low cost dealing service (e.g. Vodafone do this too). There is nothing unusual or dodgy about this if that's what you mean.

Thanks, Clubman. Unfortunate phrase by me.