Most places in London (the main city area) could be covered in 2-3 days, would be a bit of a stretch but worth so that you can spend in the country side at leisure.. Here is my story which i wrote on a different platform: https://trips.lonelyplanet.com/s/zscjye
Hi Swetha,
I believe this guide will be useful for traveling in Scotland. https://travellifo.com/things-to-do-in-loch-lomond/
Scotland's Lake Lomond and The Trossachs National Park has 10 things to do.
The national park contains over 50 specially designated sites for environment protection, as well as 22 lochs, two forest parks, and 21 munros (Scottish mountains), which are home to a variety of animals. By surface size, Loch Lomond is the largest inland body of water in the United Kingdom. Visitors can rent a canoe or kayak, spend the day exploring the nearby towns, visit Rob Roy's grave, take in an aerial adventure park, go biking or climbing, or take a vintage steamer on a lake excursion. Here you can experience a number of short and easy hiking trails in addition to a few of Scotland's most well-known long-distance trails, like the West Highland Way and the Three Lochs Way.