Notice and xmas pay

I gave a months notice which will bring me up to working 3 weeks and then 1 weeks paid holiday over the xmas period, Am I due pay from current employer for public holidays over the xmas period,

i dont think so ...as you wont be an employee !
however if your in a new job - even a day or so before - they must pay

also holiday pay depends when their holiday calculations start ...not everybody goes by calander year, are you certain you have one weeks holiday pay ?
Ive seen situtations where people leave and have deductions from holiday pay ( as holiday pay is sometimes front loaded, i.e. get paid two weeks at summer but not having worked enough hours / months )
...altough I think must be in T+C or contract

If your employment stops during the week ending on the day before a public holiday and you have worked for your employer for the previous 4 weeks, you should receive an additional day's pay instead of the public holiday.