I haven't had the e-mail, but there is a double points registration link on avios.com if you go to My Account->My Offers.
Switch to your Lloyds TSB Premier Duo Avios American Express® Card to collect Avios twice as fast. You’ll get double Avios from 29 June to 31 July on almost everything you put on your card, as long as you activate the offer by the closing date. You'll need to click below to activate the offer. Terms and conditions apply.
It looks like the BA Amex 241 will be delayed by another month now!