Hi Ankita, I strongly suggest you to explore United Kingdom (London,Scotland,Northern Ireland & Wales). Reason for the suggestion:
1.If u want to visit London & Spain u need to get both UK visa & also schengen visa. Cost will be extra for getting 2 visas.
2. Exploring UnitedKindgom will be awesome experience I have explored across UK, you will get to explore from Snow capped mountains to Beautifull beaches to Vibrant Night life to Beautiful islands.... Happy to help travellers.....
Hey Ankita if you are planning a trip for Europe then you must visit www.eartherntravels.com here the experts can assist you with the proper planning including all the sight,tours and transfer etc. At the most affordable prices you can make your vacation more enjoyable and hassle free..!!