@BasilHumefound this that relates more to your tyre situation, I've put the conclusion first but there are important factors to read that came before and you can read the whole page here - https://www.oponeo.co.uk/blog/better-tyres-in-the-front-or-back-test-results
"CONCLUSION:
There is no ideal solution for tyres that differ significantly in performance either, but just like for combinations 1 and 2, it is advisable to fit better tyres on the rear axle. Front-mounted tyres in better condition significantly reduce the stability and handling in emergency situations and in wet weather. To reduce the risk of skidding when maneuvering suddenly, it is recommended that the better tyres should be fitted to the rear axle despite the deterioration in braking distance."
What came just before -
"Combination 3 – Much better tyres on the rear axle
In this case, imagine that you have two completely different pairs of tyres (model, production time, tread depth). If you mount the better ones on the rear axle, braking on wet roads with an ABS system will deteriorate significantly. Taking corners on wet roads without an ESP will worsen to a medium degree. The following will deteriorate less:
sideways aquaplaning,
wet handling with ESP,
ABS braking on dry road surfaces.
Combination 4 – Best tyres in the front
If you mount your tyres that are in better condition at the front and your tyres that are in worse condition on the rear axle, three of the following results will worsen significantly:
wet handling without ESP,
wet handling with ESP,
changing lanes on wet roads without ESP.
Such a solution also makes cornering worse on wet surfaces.
On the other hand, braking on dry and wet surfaces as well as aquaplaning resistance don't worsen."