That's the one Cory. On e-bay, they normally go for around £25 to £30, compared to £50 to £60 for the Hasegawa boxings. From memory, the original retail price was £20, and I'm hoping Revell re-release it soon.
Just a brief description of further differences between the FG1/FG2 and other Phantoms, additional to the small details already mentioned.
The RR Spey engines were bigger and deeper than the J-79s normally used, which meant that the entire aft fuselage was wider, with wider intakes. The rear section of the underside had a pronounced droop towards the rear, with the jet nozzles being very much larger in diameter, and an entirely different shape to those various styles seen on the J-79.
There were auxiliary intake doors on the top and bottom of the fuselage, very prominent, navigation and position lights were different, the radome shape was slightly different, lacking the 'bullet' beneath as on the 'C' etc, landing gear main wheels were larger and an entirely different pattern, and the fuel dump was different. The MB ejector seats were also the standard British type, with full harnesses, as opposed to the US torso harness type.
Smaller details abound and, of course, internally, including the cockpits, everything was completely different. Various additions were made, including periscopes for the 'back seater', but these were specific to certain aircraft within certain squadrons.
The 'British' Phantoms (part built in the UK) also had glide slope antenna on either side of the fin, and a different shape to the the small nose intakes, as well as the extra-extensible nose leg on the FG.1 with extra torque link. At roughly mid service point, the RWR/ECM pod was added to the top of the fin.
The in flight refuelling was done via a probe which folded into the fuselage on the starboard side, unlike the receptacle on the top of the fuselage on other versions.
Correct designations within the 'Phantom family' are F4-K, built for the Royal Navy as the FG1, which also had the slotted tail planes, for extra control at low angles of attack, and the F4-M, built for the RAF as the FGR2, which was equipped for the Fighter, Ground attack and Recce role.
Put a model of a FG1/FGR2 alongside say, a model of a F4-J, and the shape and differences are immediately obvious. I once converted a 'J' or 'D' (can't remember which) to a FGR2 and it was a big job !!
The other RAF Phantom, the F4-J(UK) was virtually 'stock' ex- US Navy, even down to the crews having to wear US flight gear, and were painted overall in an 'equivalent colour' of 'Flint Grey', similar to the Barley Grey of the RAF version, but with a distinct blue tinge. These served only with 74 'Tiger' Squadron as a temporary 'fill in'.