Upvote:10
No. UKVI guidance specifically states that travel arrangements should not be made prior to receiving your visa.
Section 4 of the UK government's Supporting Documents Guide for Visitors lists flight and hotel bookings as documents that are NOT required to be submitted with the application:
4.
Documents you should not send unless specifically requested.
This section provides guidance on the types of documents that are not required to consider your application.
...
hotel bookings
flight bookings
...
If you present documents that are not required you may give the ECO the impression that you donβt understand the rules or didnβt bother to read them.