Do We Ever Really Care Who Lived In Our...
Home & Garden17 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.Normally there are two doors to pass through. One for "Nothing to declare" (green route) and one for "Something to declare" (red route).
If you have nothing to declare then walk through the green door and you are very unlikely to be searched.
I think being stopped and questioned is a VERY rare occurance.
They may only do this if, for example, your luggage is much heavier when coming back than it was when you went out. Or if they suspect you are smuggling something.
If you get stopped you will be asked where you have been and why, what you bought when out there. They will then probably search your bags and look for electrical items brought abroad (Cameras, Laptop etc), or jewelry or drugs.
If you are not planning to smuggle anything then I would not worry, I have flown many times and never been stopped.
The answers given so far relate to arriving in the UK. Arriving elsewhere can be very different. For eaxmple everyone arriving in the US and many other countries has to fill in a customs form. Mostly the official will glance at the form, collect it in and send you on your way, but you will always see him/her. Here if you go through the green channel you won't see anyone most of the time.
There's also a blue channel for EU arrivals