For the guy asking about the hotel from T1, it is indeed the one you can see on the northside of 27R/09L.
Don't bother getting a taxi from T1, it's not worth the money and the driver won't like you as he want's £40 London fares and has to come back and queue up again as I found out when I arrived for an interview at LHR a few years ago! You can't really walk it either.
Go to the Central Bus Station (signposted, you follow an underground travellator from T1 towards the tube station and the bus station is above it). 5 minute walk.
Go to the local buses stops, 16 - 20 I think, and get almost any bus, best ones are 555/556/557/285/111/140. They're all free to the Rennaisance, they go through the tunnel then on to the Bath Rd., you'll see the hotel on the right after 10 mins or so.
Enjoy.