We got a new Bosch washing machine in September last year, the model we got was around 80kg and we're up 1 flight of stairs. That was no issue for the AO guys who were brilliant, the issue is the entry into the kitchen.
It's a normal width door and you can walk into the kitchen normally without thinking about it, but the positioning of the door means the kitchen bench comes out at an angle and you can't carry the washer straight through, you have to lift it up and carry it horizontally up and over the kitchen bench, it's a really awkward corner - it took them ages, to me, to you to, me, to you and all that but they did a brilliant job, rewarded them with some beer. We're plannign to gut the kitchen and moving the door opening is one of the jobs on the list.
We've used John Lewis and AO for kitchen applicances and they have both been faultless for us up to now. Bung them a tenner each and a 6-pack and they'll be as happy as larry!
If they won't take it up the stairs, simply get them to leave in a secure space at the bottom or get them to move it as far as they can and get some friends to help. Who is plumbing it in?
A good local independent may deliver/install.
