Definitely over £150, possibly £200.
Remember, no RAM, no case/PSU.
I can't see these two selling for £150/200 personally, but I could be wrong.
Used i5-750 CPUs are selling for £65+ on eBay (Buy It Now), £51+ (auction).
Motherboard is difficult to sell online because it's only worth up to £30-40 and it would cost £15 alone to post it