Hey Linda, have you found a solution? Maybe you could post a pic for us.

Is this a recent kitchen installation? Could you ask cabinet maker to adjust the base units across to close the gaps up a bit more? Even if the splashback needs to be re caulked, better than trying to infil with stainless steel angles.

I'd suggest that the first thing on the agenda would be to come up with an actual design. If there are going to be big changes, you might want to think about a kitchen design specialist. Once you have your design, decide on a budget. That will tell you roughly whether you're looking at granite countertops, caeserstone, corian or laminate. Same with cabinetry: everything is a function of price. By all means, have a good look around kitchen places to see what sorts of surfaces are available, and what appeals to you. And don't forget appliances. Ultimately, though, most of us are constrained by budget.

It looks pleasant enough , and personally I'd keep the benchtop as I like the warmth of the wood -- a bit of age and wear adds to the character IMO . I wouldn't glue anything over tiles -- I'd chisel and sand and get a decent base , as I'd be worried moisture , bacteria , food waste would somehow get into the grout and gaps etc , even if you put skirtings around the edges . Mind you , I prefer tiles , be they square or subway or modern with metallics , they seem more interesting than a coloured piece of glass ( splashback ) , even if tiles are potentially more work . Maybe I'd just update my tiles , but I'll want and see your new photos .