1) Are there any good grid-tied hybrid inverters in a similar price range that you would recommend?
I'm not familiar with the options available in the UK. I'm in Australia. Others may be able to chime in. But I'm sure there will be plenty of choice from major brands in the industry. Fronius, SMA, Delta, ABB, Goodwe, SolarEdge, Sungrow, and so on. Then there are those more targeted at DIY like Victron.
2) How do I know if a hybrid inverter is of the off-grid or grid-tied type?
It will be stated in the specifications.
3) Do grid-tied inverters pass through any extra grid power that might be required OR do I need a separate device for that?
Grid tied inverters don't "pass through" power from the grid. They operate in parallel with the grid.
4) I don't intend to export any power back to the grid but would I need to inform my energy company that I'm installing a grid-tied inverter?
The regulations concerning installation of small scale generation systems vary the world over and they vary across regions within each country so I can't comment on the requirements in your specific case/location. You need advice from someone with relevant knowledge in your area.
Usually the local electricity distribution authority/company will have a section on their website about solar PV / small scale generation connection approvals.
A rule of thumb / litmus test to have an inkling as to whether you'll probably require approval is whether the system can energise any circuit still connected to the grid. Just because it is export limited to zero does not necessarily meet that standard (e.g. if the export limiting is done via current clamp measurement). Typically (but not always) systems not requiring approval are those in which the circuits being supplied are completely isolated from the grid.
Your comments and questions make me think you are putting the cart before the horse.
I suggest stating what it is you want to achieve by adding a solar PV / battery system. Is is to save money, is it for backup power with the grid goes down, is it to go off-grid, just want to have a new hobby? No reason is right/wrong, but it affects the path taken.
Once that's clear then the process to identify suitable technical solution/options to pursue becomes clearer.