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I’m sure you will check, but for your NE panels, generation will be very low. Check very carefully before going for those as they’re unlikely to be cost effective for a long time.
Was going to be about 10 year payback time for us which was the product warranty period, matching what @Howard says above, but our quote was about £12k last year for 6 panels (SSE facing) + 9.6kWh battery. Not worth it. If that spec got down to about £6-7k then I’d probably jump.
In addition to the ASHP woes above, I've talked to (and paid £500 to) Octopus about a solar survey. They reckon they can get 5 panels maximum on SW side, but the NE of the house has more potential... Not feeling it for just 5 panels (£5400 for just panels, +£3k for 5.2kWh battery) so if the NE thing doesn't work out, I won't go forward and hopefully will get my deposit back.