Two very valid posts.
The suit and laptop 'disguise', as you quite rightly point out, only rings true in certain areas.
Some parts of Sunderland and Newcastle actually dictate not wearing a suit (I'm considering buying a shell suit from a charity shop).
Everything valuable, minus the punt funds, is locked out of sight in the car.
This thread is making me question the correct whereabouts of the car, and my general planning skills.
Which is all well and good, unless you are worried about the car being stolen! If I left everything except the punt fund in the car, and then came back to find the car broken into or stolen, then I've got no money to get home, and no phone to call a cab/friend/police.
And if the situation turns out to be a set up, and you get mugged by the pimp/whatever, and he takes your car key, it doesn't matter if you've left your valuables in the car or not.
Which is why it's a +1 to park somewhere YOU want to park, rather than where you're TOLD to park.
(plus, sometimes - more often then not - you need your phone with you for door/flat instructions, so you can't leave that in the car either. Fine if you leave your expensive smart phone in the car and take a crappy old Nokia with you, but I don't use a crappy punt phone, and I'm sure I'm not the only one)
It's all about just playing it by ear and if in doubt, bail