Resident in Belgium, working in UK

I will shortly move to Belgium with my partner for c. 18 months. We currently live in the UK and I plan to continue my work in the UK remotely with the occasional commute back. I know that as a Belgian resident I will be liable for local income taxes on foreign income. I'm struggling to find practical info on how to go about my tax affairs and wondering if anyone in a similar situation has any guidance? Specifically can I claim tax relief at source in the UK or will that all happen in Belgium? Any pitfalls to look out for when proving foreign income and how it has been taxed abroad? And last but not least: what sort of financial hit can I expect? Income tax levels are considerably lower in the UK and after looking at various calculators it looks like where in the UK I'd pay about 25% in taxes overall in Belgium this would be more like 37%. Many thanks