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@Philip_J_Fry
You have two options (one or the other or both):
Compact/CX chainset - take note that if your FD is braze on you might need to find a new band on derailleur, which will need to be 6600, or the same generation (5600/7800). FD pull ratio was changed from 6700 generation onwards. Also 6600 chainring spacing is slightly different to 6700 - 6600 is closer to 9 speed spacing, however it shouldn't make a difference, you'll just need to be more careful with FD setup and toe it in/out slightly to make it shift properly.
Larger cassette for the back, which will require a long cage derailleur. Here the 10speed 6600 RD pull is the same as 6700, so a 6700 long cage will work perfectly. In terms of cassette options, find a suitable 105 5700 cassette, or MTB 10 speed cassette (check the RD capacity of the long cage though).
Protip: if the 11-28 you have is indeed ultegra (check the lockring), it'll be 6700. Grab whatever 11-XX 105 5700 cassette you want with the bigger cogs, and use the old ultegra spacers and lockrings, this transforms the 105 cassette into ultegra level weight weenie. The main differences between 105 and ultegra from that gen is that ultegra has an alloy lock ring, plastic spacers, and a shot peened finish. The shifting is the same (people claim it's better but the ramps on the cassette are machined in the same way - there is more difference in the RD action). Remember that you need to find something with an 11t small cog to do this trick, as there are two different size lock rings, 11t and 12t. Or get whatever small cog cassette you want and order an alloy lockring from ebay/here/wherever.