That's really expensive! Have a look on Seapets, they have the same viv for £43.59. It should be fine depending on the size of the corn. It would be best to put in a divider if he's only small, and move/remove as he grows. Also, remember to be careful with the sliding glass doors, they can squeeze out when little, so either a plastic paper binder or piece of folded cardboard will stop any bids for freedom http://www.seapets.co.uk/products/reptile-supplies/reptile-terrariums/vivexotic-vivariums/vivexotic-vivariums-lx-models/all-products.htm
i've got the lx36 although 8 hasn't yet moved in to it he's still in his faun at the mo but at the rate he's growing it won't be much longer till he's in his big boy viv! wish i'd seen the seapets site before i'd bought mine!lol oh well i know for the next one :-)
Also swell reptiles have it for a similar price - I used them because I wanted to order extra stuff at the same time, such as a heat mat, substrate and snake cave which seapets didn't sell so it worked out better for me, but if it's just the viv you need seapets is cheaper :)
The heatmat should cover between 1/3 and 1/2 of the floor of either the faun or viv, so unless you have an overly large one at the moment you'll probably need a new one?