There will be a bit more red tape hurdling and a bit more cost involved on importing and exporting... so those little (or big) red boxes may cost a little more when importing but it will depend on whether posted train stuff will have to go through Parcelfarce system where they will lob on their handling fee (£8-£13), or that couriers who deliver directly from EU into apply a 'handling' charge
BUT...
The real increase in hassle will be when we want to travel (whether train related or not) into and across borders in EU, especially if driving.
Your passport has to have more than 6 months left before you even consider entering the EU.
Where it was just a case of slipping through the customs office e-gates at the border, it will now mean that Brits will be a separate entity and will have to queue with all other non-EU citizen in separate lanes.
And of course you will have more of a chance to have your luggage checked (those hidden pieces of LGB may be exposed).
Studies show that Brits will have to wait in lines at airports for approximately one extra hour.
When entering the US everyone who is not a US citizen is considered an 'alien'... we are now The EU's new aliens.
We will not need visa-waivers if staying less than 90 days but we will have to now pay for one to travel to the Schengen area countries for over 90 days in one year (Austria, Denmark, France, Germany, Norway, Poland, and Sweden).
A hassle will come for those of us who cross borders within the EU. Where it was a case that we had no checks at all if we drove, for example, from France to Holland to Germany. Now a Brit will have to go through customs at the border where you leave the EU. This applies to all countries who observe the Shengen agreement:
(Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovak Republic, Slovenia, Spain, Sweden, and Switzerland).
There are three islands that are also part of the Schengen Zone, even though their borders are outside of the continent: The Azores, Madeira, and the Canary Islands.
If driving you will need an International Driving Permit (IDP)
You will need a green card from your insurance for each trip
A GB sticker has to e displayed.
Although some of the EU countries may 'partially' accept the EHIC health card for a period of time, it is now a case that we need to get full medical insurance when travelling to cover all eventualities. This will mean that insurance costs will bound to rise to factor-in the disappearance of the EHIC cover.
So this may not mean too much to those of us who do not travel in the EU very much, if at all, but as a person who does, and has enjoyed being part of a frictionless system, I find that, now, being considered an 'alien', in the world as it is, is a mighty step backwards....