There are very few and you should check the details of what is meant by ‘first class’
We have found a really excellent 5 day tour of Britain which is certainly first class and I have posted more information below
For more information on touring Britain you will find the official tourism site Visit Britain worth a visit
Here is the 5 day tour we found
Great Value Luxury Britain in 5 Days
We found this and many thanks to them at SightseeingTours.co.uk