Never ever EVER trust what the estate agent says to you, in my experience many lie to suit their own agenda and dont give a f**k about you (appologies to the very small percentage who arent like this ).

If they are doctors i very much doubt they are time wasters, they got enough to do with their time. If they looked at it in the first place they were interested, a second viewing means the are still interested. Buying/selling houses is stressful and things go wrong all the time. The place they were buying fell through, i'd still want to look at an old survey before getting my own one done cos would give me an idea.

Ignore the estate agent.

These people are just trying to buy a suitable house and if your lucky it'll be yours.