I bought 2 of these yesterday, and I will be buying more; you just can't have too many Spitfires
It is odd that Revell chose the Mk II as I am sure that most would want to build a Battle of Britain (BoB) Mk Ia. It appears that they have measured the BBMF Mk II (which did actually fly during the battle) but, because it has been restored to airworthiness, there are compromises with the details. There also seems to be odd details gleaned from other, or at least one other, Mk II. The only real noticeable external difference between the Mk Ia and the Mk II is the Coffman starter cartridge bulge forward of and below the exhausts on the starboard side engine cowling. So there are a some issues with the kit, but nothing that is insurmountable.
Quickly off the top of my head:
The ailerons are of the metal covered type, this would basically be correct for the 2 marking options, which are circa 1941; although many Spitfires were retro fitted with them, for a BoB Mk Ia fabric covered ones are required. This should be a fairly easy fix and it is very likely that there will be resin ones available soon.
There is an odd plate between the middle pair of machine guns on each wing, on the spar line. These seem to be from a Mk 2 that has these strengthening plates fitted, remove them and reinstate the detail.
The wheel well bulges look a bit iffy in shape, they should be more of a kidney shape, and a bit less prominent? A bit of filler and some careful sanding should fix it.
If you open the cockpit then you might want to remove the moulded on crowbar on the door, also remove the flare rack on the seat. I don't know where the detail on the seat back comes from but it should be widely ribbed padded leather. I still have to check out the colour call outs in the cockpit.
The Coffman starter bulge is a separate item, leave it off for a Mk 1a (Revell could have easily produced a correct Mk Ia and simply included this any way!)
The antenna mast is missing the pulley that diverts the antenna wire down into the fuselage. Simply add this from a triangle of plasticard, as most kits depict it. I will attempt to produce the pulley wheel as well!
The cone shape on the tail fin is more reminiscent of a Bf109?
The elevators are fabric covered, but could possible do with improving, but a light sanding. They are, like all of the control surfaces, separate so they can be built with the correct downward angle for a parked Spitfire
The oil cooler is of the later Mk V round opening type, again this will probably be available as a resin item. I don't think that this will be too difficult to fix.
The wheel wells lack detail, not that there is a mass of detail that is required.
The shape of the spinner and the propeller blades need investigating.
I've a feeling that the pito tube is too large, but I need to check that out.
The surface detail is well done on the wings and upper tail planes, but looks to have been done by a different designer on the fuselage! It consists of recessed rivet detail and panel lines. The rivet detail on the wings is nice and fine but on the fuselage it looks more clumsy? Studying it I think that those on the fuselage are either just deeper or closer together, or both. I think that under a couple of coats of paint they will be OK, we will see.
Thankfully the mirrored instrument panel as seen in the pre-production samples has been corrected and is possibly the cause of the delayed release.
All in all not a bad kit, it certainly looks like a Spitfire and it could become the basis if a very nice model. It is a pity that Tamiya haven't produced the early Mks, but this is far, far cheaper than anything that Tamiya would produce, even with lots of after market goodies. I got my 2 from T7 Models for £20.00 each