If you don't have anyone who can come with you, or who you particularly want there you could consider a doula (I think there are hardship funds to help with the expense) or a student midwife.
Also you could labour at home for as long as possible which will make everything a lot more comfortable for you.
Would you consider a homebirth? You will have two midwives who will stay with you throughout, and you can transfer in at any time if you aren't happy with it.
Lastly, you could have someone just on hand in the waiting room incase you need a cuppa or something which would just take a bit of pressure off.
I found having birth partners a bit distracting and felt a bit self-conscious (my best mates have now seen me poo myself, that was a special bonding moment), but equally it is useful to have someone to tell you to get up and keep moving when you are knackered and want to lie down.