You could make an offer to them (explain that if they take you Court and win, you will apply to pay by instalments anyway). As long as you have a settlement agreement which is in full and final settlement of any loss or damage arising out of the incident, trying to sue you thereafter is going to be the devil's own job.
You do want to get receipts from them or proof of purchase (ie bank statement, credit card statement etc). BUT remember that the aim of damages in negligence is to put the injured party in the position they would have been if if the negligence had not occurred. Unless the equipment was brand new, you need to argue for "betterment". Ie if the Macbook was 3 years old, you should offer the price of a 3 year old Macbook. You will also need them to prove that it was damaged beyond economic repair. In terms of the clothes, you might want to ask them what they were. MOST clothes would wash. Ask them to produce the clothes. Ask if they were washed or dry cleaned before they chucked them. (Remember they have a duty to mitigate their loss - so just bunging stuff in the bin without even trying might not be mitigation). Do not be afraid to ask for ALL their evidence on which they rely.
I would suggest making a pre action offer. Costs CAN be claimed in the SCT but they are very limited. If you google CPR Part 27, there is chapter and verse in there as to how it all works.