Well, if you've ever seen Walkabout you can never forget her.
I saw Jenny Agutter just a couple of days ago. I was helping an ex-girlfriend install an exhibition of her work in an incredibally posh shop in the West end of London (The General Trading Store). Anyhoo, I walked out of the customer toilet and almost bumped right into a woman in a cardigan and jeans, shopping for stationary with a much older lady. Bugger me, it was Jenny herself.
I didn't say "hello" as it would have been a bit intrusive, but it was great to see her none the less. Apparently Pierce Brosnan had been in the shop too that morning, but I didn't spot him.