Citizens Advice will be able to help with this one.
1). Less than two years continuous service : Sorry the Employer can do whatever they want as long as there is no discrimination based on Disability/Race
2). More than two two years continuous service :3 months notice is required for qny changes to contract
Furlough Jobs : Must have your Agreement Without your Agreement they can make you Redundant with notice a per contract, plus 1* weeks wages for each completed year (over two) to a maximum of £525pw *1.5 weeks wages if over 50