From King’s Cross St Pancras, take the Piccadilly line directly; if crowded

https://jaspersrjt294.wpsuo.com/getting-to-heathrow-from-reading-and-oxford-direct-lines-and-links

From King’s Cross St Pancras, take the Piccadilly line directly; if crowded, consider one stop on the Circle/Hammersmith line to an easier interchange at Paddington.