Not a lot of headroom for a 6ft+'er in the Power Lizard tho.
Are there any 1 person tents that you'd want to carry that are going to have any headroom for 6ft+er though?
If there is, I've yet to find it
maybe not in the price range that the OP is looking at but there are LW solo tents for the tall .
I will not mention other brands but the TT Notch (two wall trekking pole supported) and Rainbow (hybrid one/two wall) at the lighter end and the Scarp 1 (1.35 kg) if you prefer the more traditional two wall design will accommodate a 195cm person.
The inner of the Scarp 1 is about 96cm high and as you can see in this shot :
it has plenty of usable length.The mat plus shoes are 214cm long.
You have about 10cm at either end between the mesh (or fabric) inner and the fly.
The inner is not attached to the two middle hooks , it would also have an arched shape otherwise (can't remember why I had it like that...)
At 195cm tall you could fit inside a 215cm long floor and you may not on one that is 250cm long.
It just depend on the usable vertical space at both ends. With inward pointing walls a 7cm mat will rob you of about 30cm of floor length. That is why folk should lay down their mats and sleeping bag , then measure from the floor up to the required height for personal comfort, then see if that "box" fits inside a tent.
The fact that someone else of your height can lay down or sit up in a shelter does not tell you if it will work for you. The reason is that some always sleep curled up (and forget to mention) other slouch when sitting up or have a shorter torso then their legs or simply use a thinner mat than you or having spent a fortune on the shelter , they pretend that their head is not in fact pushing against the roof. here is a quick and rough drawing to show how a 220cm floor could have 40 more usable centimeters than one that is 250cm long.
When you add one mat to another you also just add the R value of one to the other to get the total.
In theory R3.5 is OK at -2C or something. On snow at -5C or so I can use the R2.5 Neo Air plus a DIY concertina mat probably worth R1.5 or so (tot R4)but prefer just to use the Exped DM7 (R5.9) The TR Prolite Plus is rated R3.8, the MultiMat doubled up should be about R2.2 so a combined value of R6 . That should work for most down to at least -5C. (you can also place your spare clothing under the mat, rain gear works well for that)