The cost of living in the UK is expensive but don't get it because it's expensive and we don't go to Europe. If you don't have money, of course you can't go to Europe, the name of vacation must be enjoyed with enough money for the needs when you want to go to a place, especially Europe.
From the details and total costs, actually there is a lot more than Indonesian money. Especially in terms of transportation. Transportation is 50% of the total costs incurred. If the plan is far away (2 months earlier or earlier) and happens to be a promo ticket. For fast train tickets, the price is relatively expensive. You can change with bus tickets between countries like Megabus or Euroline, but with a shortage of long travel times.