No, the Slimline-RF / neoAir are not compatible with the UH1-W
The compatible thermostats are;
- PRT-W
- PRT-UWTS
- PRTHW-UWTS
Please note these thermostats are now discontinued products and this is for information only.
It is unlikely you are going to get hold of these thermostats. Therefore the wiring centre would need to be replaced with a UH8-RF V2 before adding the Slimline RF or neoAir ranges. This can be done by an electrician.
https://heatmisershop.co.uk/heatmiser-uh8-rf-v2-8-zone-wireless-wiring-centre/
The old stats will not work with the UH8-RF V2