Sorry baloo, didn't want to come off as being hostile.
No problem.
Someone could be quite happy wearing the the same 2 pairs of jeans 4 shirts and 2 sweaters for the next 6 months, how can you judge entry on that? What if someone plans to shop in Canada and buy clothes? When I came back from the UK I could only bring 20kg in my luggage.
I guess that there are plenty of things we "do" that give POE officers cause to ask questions

If I want to shop, and they stop me, I show that I can afford to buy stuff, but usually I leave it with my Fiancee.
International travel is no longer a good experience, I better not get started on baggage limits !
Have the stuff shipped to your girlfriends house addressed to her if you want your things so bad, otherwise ditch it. I'm assuming to be with your girlfriend is more important. Pack your suitcase with what you need for vacation and the rest is history.
Good advice.
I don't imagine British citizens get hasseled much at the port of entry on a first time visit.
Not usually, but if I was the 1 in 1000 that gets sent back on a return flight, the statistics don't mean a thing

(I have no idea what the real number is).