Just activated the bonus on my LTSB card and still have the 10x promotion running for another couple of weeks - if they give me 25 Avios per £1 for UK spending I'll be extra pleased as I have car insurance to pay for next week (£850) and the balance of a holiday cottage rental via PayPal (£500) among other things!
What it does mean though is that I can carry on using the card day to day right through the bonus end date because 2.5 Avios per £1 is good - I was going to switch to spending on my SPG Amex but I'll keep using this until the end of July now.