Lots of generic things are the same, just weigh food, don't track a large orange for whats a large UK size... the US ones are a LOT bigger, I checked the calorie count for foods/sizes/weights and I think our best bet is always to go by weight.
However, you don't have to use the exact brands. Most US members can't find all of the same brands, either; it's a large country with huge variations in what products are available. The meal plans are general guidelines, and you can always substitute a similar food. In fact, most people have to do this with fresh foods; the computer program isn't sensitive to seasonality, so it might list fresh melon or berries in January. If you're not Bill Gates, you have an orange or some frozen berries instead. As long as the food you're substituting is in the same general category and has roughly the same nutritional value, it will be close enough to keep you healthy.
No. Spark is a global website and does not provide locally sourced meal plans for the hundreds of nations the members come from.
You need to manually enter your own foods.
Turn the meal plans on and use them as a guide as to what to have, and just use locally sourced replacements. You can either just tick the meal plan anyway (how different can it really be? It's not like it says eat a tomato and you choose a chocolate bar instead), or you can just not tick the meal plan foods and then manually enter what you did eat.
I have been considering changing to the Spark meal plans instead of my own. However, when I tried it out I found that the vast majority of the branded foods were American, and not readily available in the UK. Is there a way to change to Spark meal plans for UK members?