Ah, so you’ve not bought the speakers yet? Why those? They are a very nicely made, recently discontinued, three-way stand-mount, best used in an all Linn system.
You should get some for about half-price, say, £750. Lots on the market because quite a few Linnies bought them recently as a way to get a free £1000 upgraded power supply, and Linn wanted to clear them out. I’d look for an amp with at least 50 wpc into 8 ohms, with good current delivery.
A Planar 1 doesn’t really do that lot justice. Better a Planar 3 and more budget amp and speakers, e,g. Marantz amp and QA or Dali speakers. But that’s another question!