6zark6, my first preference would always be instilagel. My NHS area dropped instilagel and went onto hydrocaine. At my last request the hydrocaine was substituted with optilube. They are all very similar and contain anesthetic, antiseptic and lubrication. Thing like KY gel do not have the same effect for me.
The three gels are usually available without prescription at most pharmacies except Boots. Boots may supply optilube without prescription.
They cost around £2-3 a syringe and come in 6ml or 11ml. The hospital may give you some.
Take a packet of your favourite biscuits into hospital, idea if peckish in the middle of the night.
Hope all goes well.
Thanks Chris