How long is a piece of string? What kind of rack do you want? Why a rack and not a cage? What kind of plates do you want - cast iron/ bumper/ olympic? What kind of bar do you want - generic cheap ‘n’ cheerful or Rogue? Etc. etc.
Once supplies are back in, you could easily pay less than £1,000 at full retail for what you want from Fitness Superstore simply buy buying the cheapest of everything you want. Or you could bust your £2,000 budget buy buying the best.
If I were you, I would start by having a chat with @aaronru about his kit and, as @ChongLordUno says, keep an eye on Gumtree & Facebook.
The advantage of buying secondhand kit is that any depreciation is likely to be nominal when the time comes for you to sell it and upgrade.
Birthdays & Christmas are ideal opportunities for you to get your kit added to gradually over a period of time at no cost to yourself!