Blue is insufficient, unfortunately. But you could ask about AUP and if it's a no then they may take mercy on you (but I doubt it). If you were planning to get there by HEX, why not take the Heathrow Connect and have a curry in Southall instead? E.g. Omi's on the north side, around the corner in Beaconsfield Road. Or Saravanaa Bhavan over the road.