Upvote:2
The UK does not require flight / hotel bookings when considering Visitor visa applications - see section 4 https://www.gov.uk/government/publications/visitor-visa-guide-to-supporting-documents/guide-to-supporting-documents-visiting-the-uk
IMHO therefore the travel agentβs mistake should not be a reason for rejection, although it does indicate that they donβt understand the UK visa application process. Luton is commuter-distance to London so the mistake isnβt totally out of line with your itinerary, assuming the ECO even looks at the booking.