My wife ,and I tried this thinking it would be cheaper than a taxi to our family in North London. The train was fine but getting luggage on and off wasn't easy. Then, at Paddington we had to haul luggage up a large stair. The London train tube system is great but again, luggage was a real problem. Some stations have escalators but some don't, sometimes requiring climbing the equivalent of 3 flights of stairs. Usually a taxi/UBER takes an hour to get us from North London to Heathrow and the cost is 60 pounds plus tip. The Heathrow express and tube train took almost 2 hours and cost us a little less than $40 each for a total price of $80 or 65 pounds. Bottom line, unless you have a small amount of luggage don't even consider the Heathrow Express and it is cheaper and faster to take a taxi/cab anyway.
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