Travel to see others work - business chargeable expence?

I am an Exhibition Stand and Interior Designer and am going to London soon to see Chelsea flower show and an exhibition at Earls Court. The only reason I am going is because I gain inspiration for my work by watching it each year. (don't even like gardening lol) I also need to see other exhibition stands to see what is happening in the world of exhibitions and again get inspiration.

Trouble is should this be a chargeable self assessment expense? I believe it should be but then anyone could state that a holiday in Morrocco was an inspirational trip!

Help! Many thanks
Claire