Sold the first part of my 45's collection to JM in 2000 when my first kid came along and was very pleased with the deal, loads of original oldies that I had picked up in 83 / 84. , dirt cheap from my mates older brothers in tip top condition after the casino closed and they decided to Jack it all in and the constant pressure from their wife's to get rid of those bloody old records in the garage !!!!
Second part of my 45's ( Stafford / Leicester / Morecambe / Blackburn / Shotts sounds onwards) to another known seller who again came up trumps. , 60 % - 40 % , when my second kid came along in 2002 and bought a lovely New people carrier,
My experiences have been nothing but positive with UK dealers, long before you could do it yourself with eBay or the hassle of lists / fairs.
Yes I know of horror stories where people themselves have been unsure whether they have owned an original or not and sold it for peanuts after being convinced it was a second issue, but these have been a lot rarer nowadays as people with thanks to this site and others can research themselves.
Still got 500 + albums. / 12 " but not selling yet till the kids hit university !!!!!!