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You generally can't contribute to an occupational scheme except while employed by the relevant employer. Obviously you can "park" (make paid up) the existing scheme and transfer it into the new employer's scheme when you are allowed. However you should only ever transfer or merge funds when you understand the consequences and ideally only when doing so would mean lower charges, more flexibility and/or less administrative hassle. If transferring in would mean higher charges than leaving the old occupational fund paid up and invested in the ex-employer's scheme then it might be better leaving it alone or possibly transferring it to a suitable buy out/retirement bond. On the other hand transferring in also has the effect of transferring in membership/vesting time which is something worth understanding.
If you would be otherwise without pension cover for a years or so after moving job then you might want to consider opening a PRSA for at least that period and which you can reuse again later if/when you are not in pensionable employment. Standard PRSAs charge a max of 5% on each contribution and 1% annual management fee but you may be able to get an even better deal on charges by opening one through a broker on a nil-commission agreed fee paying basis (a few hundred € I think). Another possibility might be a standard personal pension plan.