Doesn't the data protection act state something like a company must release all records held on you for a reasonable fee, the figure quoted doesn't sound reasonable to me.
I would suggest getting it in writing from orange (I assume they have already written with this to your solicitor) and adding that letter to your application in support of the availability of the records and the reason why you have not included them at this time.
I would also send a copy of the letter to the information commission suggesting that orange are not complying with the law.
I would also get a solicitor who knows his **** from his elbow, he should have already done this on your behalf.
