Hi Rugby girl...yes, I think you should get in touch, and see what they advise. I guess you are in the "honeymoon period" and as your pancrease produces less insulin, you are going to need to inject more..no surprise there.
But, and this is why I think you need to get professional advice, I am not sure what point you need to add the background insulin. It is fine to kepp increasing the humalin, but you need to be careful that you don't make yourself hypo. I think you have had good advice, and this will happen when you fasting BG rises, but it might be worth at least a phone call with the nurse to discuss. Haave your record book to hand, so you can discuss any lows as well as highs etc.
enjoy the camping...and make sure you take loads of hypo treatment food etc with you!