Have you looked online for equipment - there is a well-known store (not highstreet) "Kiddicare" that sells lots of lightweight strollers and other stuff - they will deliver really quickly (usually overnight) and they offer HUGE savings on the highstreet store prices.
the "Rochingham" mattresses they sell are superior to any I have bought on the highstreet - and LOADS cheaper (their foam ones are awesome - thick, luxurious and durable!)
George at asda does really inexpensive babygrows and fleece blankets etc.
The baby doesn't need more than babygrows, vests and nappies in the early days - no need for "day" outfits. The baby's priority is comfort and not style!
Yes - I agree - don't forget to eBay stuff as you finish with it (unless it's of sentimental value or you will need it again)
That list on the back of the mothercare catalogue of what you need - most of it ISN'T necessary.
Always get your baby toys at the charity shops as and when they appear if you can - most are good as new - and baby doesn't care where they came from. You can give them a wipe over with some dettol spray if you're concerned the baby will put them in his/her mouth.
Toys are not necessary as such - but IF you get them that's the place to go!
A few plastic (not sharp) kitchen utensils, upturned pans with a wooden spoon, etc. can provide good play activities without the need to buy toys! Just be sensible (as I'm sure you are) about what is chokable, or has loose parts!
I hope you can enjoy the rest of your pregnancy. I'm sure right now it seems a "race" to get everything ready - but hopefully you'll get what you need in time - if not shortly after.