If you buy a ticket to Gatwick then that covers the entire journey, including LU.
The price you quote will be an Advance, it will cost more on the train or from the ticket office as only walk-on fares will be available on the day.
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... think your fare of £18 'maybe' an APT valid on EMT & Conn trains only - which would be FCC from STP.
There's no such thing as "Conn trains". It says "+AP EMT& CONNECT" which is short for "CONNECTIONS". A connecting train could be operated by SET, SN (including Gatwick Express) or FCC.
2FS - ADVANCE EMT
00486 - +AP EMT& CONNECT
1 Adult @£ 16.50 = £ 16.50
__________
£ 16.50 (with Railcard)
Standard Class Single
Restriction : AR
Valid on East Midlands Trains
(TOC Code

MT) and connecting
services.
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Okay I'll do that, thanks a lot for your help.
If it's convenient to go to the station do that but otherwise book on EMT's site as posted above and print a copy of the itinerary from the website if you like.
You should comfortably make the 1200 from VIC, and you may make the 1145 if you're quick! This would get you to Gatwick 15 or 30 mins earlier than booked. This is because the booking system has to allow a very long time to cross London - much longer than it really takes.