Edinburgh to London transfer by Train

Greetings After cycling in Scotland I plan on a taking the Caledonian Sleeper from Edinburgh to London on part of my cycle tour of GB. The choices for seats is a little confusing. There are a couple of choices that look the same but carry a different fair. By icons in the boxes I can see the difference between a berth and a reclining seat. But there are a couple choices with the same description but @ different prices.
1)Standard advance single @ 49.50 All these show bed icons.
2)Standard advance single @ 66.00
3)Standard open single @ 115.00
4)Standard open single @ 126.00
5) First open single @ 152.00
6) First open Single @ 175.00
My travel date is 18/09 if that helps.
There are a couple of choices other than these but they show a reclining seat I am interested in a berth. The Question is. What is the difference between OPEN and ADVANCED? And there are two choices that look the same @ different prices #1 and #2. Now also the site mentions a supplement on choices #4 and #6 is this for a private berth? I called First Scotrail for some clarification but the phone tree went on forever.
Any help will be appreciated.
1)Standard advance single @ 49.50 All these show bed icons.
2)Standard advance single @ 66.00
3)Standard open single @ 115.00
4)Standard open single @ 126.00
5) First open single @ 152.00
6) First open Single @ 175.00
My travel date is 18/09 if that helps.
There are a couple of choices other than these but they show a reclining seat I am interested in a berth. The Question is. What is the difference between OPEN and ADVANCED? And there are two choices that look the same @ different prices #1 and #2. Now also the site mentions a supplement on choices #4 and #6 is this for a private berth? I called First Scotrail for some clarification but the phone tree went on forever.
Any help will be appreciated.
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If you are 99% sure of your journey time, get an advance ticket. If not, get an open.
a serious case of small cogs
The one time I paid full price for a sleeper (normally I get a Bargain Berth) the fare was sixty-odd quid so I'd guess that was the fare for a bed rather than seat.
Almost right, but things are a little more restricted on the sleepers as all seats and berths have to be reserved anyway. You can't just turn up on the day and be guaranteed a seat or berth even if you have an Open ticket.
Basically, there are a limited number of advance booking seats and berths on each train. The sooner you book the more likley you are to get a bargain price. Once they've gone you have to pay the Open ticket price.