The lowered profile on that jack doesn't extend very far back, you'll only be able to jack on the sills. You might find you need more than the 1.5t capacity too, depends how much work you do on cars besides the 306 i guess. I've not heard of sgs, but i'd class that under suspiciously cheap. I got one of these a couple of years back: http://www.ebay.co.uk/itm/Arcan-Aluminiu...4181f8a6ed. It's nothing special, but it's doing the job and has only needed a couple of minor adjustments, making sure all the fixings are tight every couple of months being the main concern. Also, the rubber stops for the handle perish and fail after a few months, something to watch for as over-extending the handle really isn't good for them.
Do you have any requirements besides shiny? Serious question, shiny is a very important consideration.
I assume low entry is high on the list, as is low price?
Torque wrenches, i have a halfords one for low-range stuff and it seems to be fine. Not sure it's good enough for a recommendation, but it does the job.
EDIT: Having just looked at the sealey rocket-lift, low entry, two-tonne, all-singing, all-dancing, let's run it for president trolley jack, it appears to be 100% identical to my jack. So it seems if you want it, but don't want to pay £200, buy that ^^^.
Do you have any requirements besides shiny? Serious question, shiny is a very important consideration.

Torque wrenches, i have a halfords one for low-range stuff and it seems to be fine. Not sure it's good enough for a recommendation, but it does the job.
EDIT: Having just looked at the sealey rocket-lift, low entry, two-tonne, all-singing, all-dancing, let's run it for president trolley jack, it appears to be 100% identical to my jack. So it seems if you want it, but don't want to pay £200, buy that ^^^.
