The sale gets very busy and pushchairs and prams are not that practical. So why not hire a sling for the event. It will cost £2.50 to hire and I am happy to take car keys as deposit. £1 from each hire will go to NCT with rest going towards the sling library.
If you wish to take the 2 week hire it will be £5 + refundable deposit up to a maximum of £100 as per normal library sessions.