For general birdwatching 8x42 is the standard choice, because 8x stays steady in the hand and 42mm keeps the view bright at dawn. Choose 10x42 for open country and estuaries, or 10x50 and above for astronomy on a tripod.
Orders placed before 3pm are dispatched the same working day and usually arrive the next working day on the UK mainland. The Scottish Highlands and Islands, Northern Ireland and other UK islands typically take 2-3 working days. You get tracking details by email once the parcel leaves the retailer.
Many retailers offer free delivery to most UK mainland addresses. Parts of Scotland, Northern Ireland and the islands may carry a surcharge. Check the product page for details.
The first number is magnification, so 8x makes the subject appear eight times closer. The second is the objective lens diameter in millimetres. Divide 42 by 8 and you get a 5.25mm exit pupil, which governs how bright the view stays in poor light.
They do, provided you check the eye relief. Look for 15mm or more together with twist-down eyecups, which let your glasses sit closer to the lens while you still see the full field of view.
Roof prism models are slimmer, better sealed and easier to carry all day, which is why most modern binoculars use them. Porro prisms give more depth to the image and cost less for the same optical quality, though the body is bulkier.
Yes. A 10x50 pair shows the four Galilean moons of Jupiter, the Andromeda galaxy and dozens of open clusters. Anything above 12x wants a tripod, because hand shake blurs the view long before the optics run out of detail.