so i will have to invest in a spare computer and insure it has internet access...

No. You can rent out a VPS for <$10 per quarter.

however what happens if i am travelling and i need to switch the gunbot off?

Nothing really, you can turn it on again whenever you want. However, for optimal results you need it to run 24/7.

Is there any other option where can i leave the bot running all day long apart from buying another computer...

As said, rent a VPS.

which VPS would you recommend for the Gunbot?

aq2725