Most vets in close proximity to a port abroad will have extensive experience and knowledge of the worming routine before returning to the UK.
I took four dogs over on the ferry to Holland and brought a different one back (!) and before leaving we discovered that one of the microchips couldnto be read! Panic! However as the dog was not returning to the UK, and travelling onwards to Finland where they are fairly lax (and they were arriving very early hours of the morning) we took the chance and it was never checked. On the one we brought back, it was checked at Hook of Holland but not in the UK on arrival.
One thing to make sure is that you get the dates correct for the rabies jab and make sure the microchipping is done first. If going to some countries they also need to be wormed with a special wormer within 30 days - we nearly got in a muddle with this, as it is a requirement for Sweden, and we took it to be at least thirty days and only realised just in time that it was a maximum of thirty days!
Make sure you do everything as early as possible, as if the rabies jab has not taken then it needs to be done again otherwise they will not be allowed back into the country without going into quarantine.
Most vets in the UK now do this on a regular basis and are au fait with the rules etc.
One other tip, if you can get hold of a scanner to take with you then you should be able to check you own dogs chip at regular intervals, as some scanners do not read all chips.