The UK is expensive. You might wnat to look at RCmart in hongkong. you will pay shipping and most probably import tax but it will still be cheaper than buying in the UK. The best value pro buggies are the hyper 7 or 8 pro
Look [link=http://www.rcmart.com/catalog/product_info.php?cPath=420_328&products_id=21914]here[/link]
Remember there are 2 dollars to the pound so it will be half the price in pounds as listed in dollars plus shipping and possibly tax (you may be lucky though)
This comes with a hyper 8 port which is a very fast engine for begginers. You can buy you Gotech engine after if you still wish (though I have a hyper 8 port and its much better than most RTR engines)