Don't bother with this. When you use your Avios for buying products, you rarely receive value for money. I saw an offer to book 3 nights in The Standard the other day which was 250,000 Avios - so you'd need to spend £250K to have 3 nights worth around £1000. Even to use points to book a hire car is just not worth the number of points you need for the price paid.

I'd use 140,000 points to go on some European trips. You can secure 4 or 5 return trips in CE for this number of Avios.