Good luck rosieyvonne. I think Hettihog has pretty much covered everything. If the little ones do weigh over 450g (or the weight that your local rescue recommend at this time of year) then you can let them go immediately and they will probably carry on where they left off.
It is really worth contacting your local rescue first, not least to make sure they have enough room to take more underweight hoglets in. But tell them that the hoglets are visiting regularly for food, because if they are borderline weight, they might think it’s o.k. to leave them. They will be best placed to give you more specific advice.
Don’t worry about hurting the little ones by picking them up, they are likely to put their spines up to protect themselves, so might end up hurting you – their spines are very sharp when standing up, so make sure you wear gloves. Just scoop then gently up and straight in to a container to be weighed in. Some hoglets are quite active and try to climb out, so just be aware of that. If you take the scales, etc. outside you can keep the stress to a minimum. i.e. scoop up into container ,weigh and either release (if heavy enough) or put into larger container for them possibly to spend the night in.
Let us know how you get on.
