Tim Barber, owner of Real Yorkshire Tours, shares his thoughts on what makes the Yorkshire Dales landscape an attraction for overseas visitors.

The most popular tour is of the Channel 5 series locations. His clients mostly include American tourist who 'burst into tears' with emotion when they visit Yorkshire.

On a few occasions, he has bumped into the cast including Nicholas Ralph who portrays James Herriot and Rachel Shenton who portrays Helen Herriot.