When selling it all comes down to potential buyers.
My guess for a domain like this you'd need to approach UK based manufacturers of travelators and possibley, escalators.
I don't know how many there are but I bet it's not alot since manufacturing isn't exactly a booming industry here anymore.
Then if you find one and they're interested - would they pay you a premium for travelator.co.uk or go for travelators.co.uk?
I don't wish to sound blunt but if you look at all the crap people have been catching over the past months and consider that this was left out of everyone's lists, kind of gives you an idea.
There are some other possible uses - like a travellers forum, it's quite a catchy name and it's one word, but I wouldn't expect a mass of interest