I've just renewed my driving license photocard as it was coming up for its 10 year expiry. The instructions say I should now cut up the old one and send it to the DVLA, but they don't include a postage-paid envelope. People questioning this on Twitter have been told the DVLA do accept unstamped envelopes, but they advise you to use a stamp to avoid it going astray. Aibu to just put it in the bin instead?