LTV World can be received here on a Sky Zone 1 dish or easily on a 60cm dish. It is on the EUROPEAN beam, not the Nordic beam.
Some footprint maps have suggest a 90cm dish for the European beam. This is actually a mistake, it stems from the European Union who moved their two incredibly boring TV channels from Hotbird to the much much much cheaper Sirius 4 satellite. It seems to have become a bit of an urban myth. The 90cm is actually only required for rebroadcast purposes, as the EU footage is used for free in news programmes by the BBC, France 24, SF Info, Russia Today, ARD & ZDF, RAI, TVE and all the other European Broadcasters. It is also provided so that we European citizens can watch the functioning of our glorious democracy, though in reality it is as exciting as watching a dying sheep.
Anyway, the reason is that the larger dish will mean that there are no errors in the broadcast stream which is ideal for editing and rebroadcast. Everybody else can use a 60cm dish and still have a rain margin.
I have never received the Nordic beam, but from the footprint map it looks more like a 1.2m or even a 1.5m would be required in London. Anyone selling subscriptions in London would know for sure.
If you have an old sky dish on your house and an FTA receiver you could have a go at aligning it yourself if you want. It would be too small for the encoded channels but you could watch something while you decide whether or not to get the bigger dish.
5 Kanal (Ukraine) has their version of Top Gear, if you like that sort of thing. The woman in it is nicer to look at than Jeremy Clarkson.
In fact, she is welcome at my house at any time ;)