Does anyone know if an Interrail ticket can be used on the sleeper? I have contacted them but am not confident of their information. They suggest a £100 per person supplement for a berth.
If I book as a family (2+1) do we get two cabins as the information seems to suggest?
It depends on the class of interail you have. If 1st class then the supplement is £100 per person for sole occupancy berths. If standard class then it is £100 per person for a berth in a twin berth cabin.
Either way you will be paying £300 but with std 2 will share a cabin and one of you could end up sharing with a stranger. If you have 1st class there is nothing stopping you buying 1 std and 1 first cabin but there is no discount for doing so.
Serco have taken the p*ss with the supplements, in the space of a few years the cost has doubled from £50 to £100, they are such bad value now that if you are booking more than a week or two in advance it is often cheaper to buy the all inclusive tickets than a supplement.
For example lots of trains in Sep still have shared cabins for £160 for 2 people or 80 per person with solo cabins being £155.
If you have std class interrail than book ahead and get 1 1st and 1 std cabin (for 2), at those rates it will be slightly more than the supplements but no potential sharing with a stranger and no need to date a box of your interail if you don't wish to.
Those are sample rates for the current stock up to 26 October 2018, From 28 October different rates apply and sharing twin cabins is only for those on the same booking. The inclusive rates are different (higher) for both Lowland (new trains) and Highland (transition period with old stock for a few months) and crucially there is no longer a class distinction.
Unfortunately the website and phone booking currently do not have any supplement fares loaded from 28 Oct onwards so what if any rates will be offered is unknown.