A quick upscale by 1.5 factor of the Mirage-delta gives 25.2m length (from 16.76m), 12.75m wingspan and height around 5.5m (the Mirage IV had 5.4m). Wing area around 110 sq.m, weight 35-38t (assuming that The Mirage-Delta would be somehow heavier by the real Mirage III). But this twin engined variant could have load about 9-10t (Mirage IV had around 7.5t I think), much better power to weight ratio and RATO would not be necessary unlike the Mirage IV (which needed RATO for fast take off).
Since I made the Mirage IV in FD-scale (and still own one variant of it), it is quite easy to use the IV as a design base.
Fairey Delta F155T:
http://www.secretprojects.co.uk/forum/i ... pic=3083.0
Comparing the "Mirage-Delta" with the Dassault Mirage III of real life, the English variant would be much faster in acceleration and climb rate, especially with the RB.106 engine. 1130nm combat radius (stat or nm) with internal fuel only is not bad at all, Mirage III is credited only 746nm. With two 1,700 lt drop tanks (or twin 1,300lt which were certified for supersonic speed) the Mirage-Delta perhaps would reach 1,400nm and being refueled by Victor K1/K2 or ideally VC.10 it could stay airborne for several hours.
Summing up all RAF and export machines from the text behind the Mirage-Delta number goes up to 1000 machines, imagine Supermarine, Gloster and perhaps Shorts as sub-constructors and Fairey doing final assembly plus some parts. Even Australia could supply some parts from its own production line.
Again, something similar could be done with TSR.2 (wish it entered service), Lighting was of course an English Electric project, but I think UK could convert all its Lightings to F.6 spec (and integrate the Blue Vesta missile as well or even licensed AIM-9). The Mirage-Delta could take Skyflash (I have in my mind to push Skyflash as earlier as possible for this scenario).
Navy would have the SR.177 as discussed some pages earlier, with RB.106 engine and main task CAP to protect the British Task Force, like in that small British AU. Refueling is a matter, since Audacious Class carriers were relatively small. Again, "SR.177 Mk3" could take Skyflash/Blue Vesta or other missiles as well. Since there is available one of the best strike aircraft ever designed (meaning of course the Buccaneer) in 12 units on each of three Audacious Carriers of this AU, RN can strike back inside USSR land or deal with Soviet surface units with Sea Eagle and Martel missiles. Submarines is a job for Gannets and Sea King/Wessex helicopters.