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I have the CST (pretty much the same, just cassette I think) and run it with a 12 FET controller (BMSB, S12P I think), up to 30 amps. You'll need to ensure your battery can deliver that current though. Mine goes along at around 24mph on the flat.

Danger.

I agree that in specific circumstances, with specific limitations (e.g. max current) the best option for increased power is to increase voltage. However, it does not follow that 48v is required for high torque. I am concerned that the OP may go away with the impression that he must have a 48v...

Avoid the A30 at all costs.

...or 30A? Or BPM at 201 rpm

That may be true in other parts of the world but not in Devon where the only patrols are on the M5, A30 and A38. Besides, a helmet and glasses make you virtually unrecognisable. I concede however that commuting (same route/time) could make you an easy target.

36v will be fine. For hills, you need lots of torque. There are plenty of Torquey 36v systems, the BPM/CST being good examples.

Why do you think the OP needs 48v?

You will struggle to get full suspension AND step through. Instead, go for big tyres (schwalbe big apple/fat franks), suspension seat post, or both.

As I've intimated I ride in and out of Exeter on my bikes, and they are not exactly legal. They are home-brew, but reasonably covert. I've done around 3000 Miles in total around east Devon. I have not once been pulled over. The coppers are simply not interested/resourced around here. I ride...

Flecc makes a good point that I had not considered. I'm no longer sure what I'd do in your position.

Its the controller that's limiting the power, so worst case is a new one (assuming the battery can supply enough current). You may be able to modify the existing controller. Locate it and take some pictures. We need to see the cables going in, out, and the controller please. Also, knowing...

As Nealth says, it's a big ask. I suspect you don't have much choice, and only have to do it for a year? If I were in your position, I'd be looking at charging at work. I'd also be thinking about a little more power and speed (dongle or self build) but you need to be aware that's it's not...

I need some form of off road capable vehicle for occasional use at work, but it needs to be road legal. I could run around in a big 4x4, but I reckon its cheaper to have a little Fiesta van, a trailer and a quad. Here it's is, less than an hour old:

...or a cheap lighter from the nearest shop will do in a pinch.

It would surprise me if a front hub lasted less than 5000 miles. In my experience, front hubs go on for a long time. The OP's bikes seem to be crank drives. It would be reasonable to assume more than a 5000 miles lifespan for the motor, as that is only two sets of tyres. I would have thought...

If you are handy with spaners, and enjoy messing with bikes, a conversion is the answer. You sound reasonably fit and active, so a 15 amp (250 watt) kit should do it. With a 15ah battery you will have a 30 mile range with some to spare. Budget c. £500 for the kit, plus the bike. DIY bikes...

I too have no problem carrying weight on my back, so I've experimented with a back pack battery. What's great is that the bike remains as close to a bike as its possible to be. Handling is vastly improved, as the battery weight is controlled by your body. There are down sides. Safety for one...

How much current is this thing pulling when de-restricted? It would need to be up toward 30 amps for the OP to have any chance of keeping up.

Nothing legal. I would guess you need to average around 20mph, so you'll be needing 25mph top speed. S-peddlec, dongled or DIY are your options.