I've ordered real steel and repros over the past few years with no issues. My current go to for repro would be 5ku stuff from WGCshop, if you're not in a hurry just use land shipping and you'll have it in about a month (I ordered some bits during the height of covid last year and it was ~a month for one package and a few weeks for another). For real steel I ordered off of ivantactical last year and just some rando ebay store beforehand, again no issues bar customs checking the ebay package, but all reached me with no issues like ordering anything else. Mileage may vary now with brexit being brexit though I guess, though I'd imagine the checks in place would be the same.