OK, we're in the Heathrow area.

Step 1 - take train to Hayes and Harlington (in our case from Reading, but it could be done from Paddington)
Step 2 - cycle 3 km to hotel
Step 3 - walk around trying to figure out how to get to the terminals.

We were hoping to walk to Terminal 3, but it appears we can't do that. However, it appears we might be able to cycle through a tunnel, and we'll attempt that tomorrow. It may also be possible to take a train from the Hayes and Harlington station into one of the terminals. We'll have to check that option.

We can see the terminals from where we are ... but getting there is not a straightforward and easy process!!