10 feedback thing unfortunately requires you to keep an eye on auction. There is no option for it, so you basically specify in description that any bids from users with less than 10 feedbacks will be canceled unless they will contact you immediately after bidding with their name and uk phone number. Then you check auction twice a day and actually remove any bids that don't comply.
I tend to use BIN on more expensive items mainly because auctions turn out silly more and more often these days.
Another thing worth putting in "Sales disclaimer" is - if you are using Paypal only and immediate payment make it very clear that you will only accept payments from verified paypal accounts. A lot of people in phone section are scamming these days by using either phished ebay accounts or using instant payment options and then claiming back the payment on their credit card as unauthorized. In either case funds are withdrawn from your paypal days after you send the goods (even if you moved funds to your bank account) and it's a real hussle to get it fixed.
I agree selling popular items on ebay is harder and harder, not only because there is plenty of scammers around but also because other sellers often use shill accounts to punch your auction to redicilous levels few minutes before the end just so their "Buy it now" pricetags seem more reasonable. But then it happens everywhere around ebay - in buy section as well. How many times have you seen something very reasonably priced, you made sure you filtered items by "UK only" and then seconds before you decided to click on "Buy it now" button you notice the item is located in "Will Ship Everywhere via Fedex, United Kingdom", meaning the guy is in Hong Kong, States or god knows where and you will get shafted by customs, VAT and handling charges. Ebay don't care about those little things because let's face it - business is business, they get comission from sale, so whether it's scammy £700 sale of mobile, or people buying from Hong Kong and getting screwed by extra charges it doesn't matter - comission is comission.