There's nothing you can do with your current account to raise the limits.
Your best option is to either use a family member's or friend's PayPal account to receive the money in future.
If you can't do this then you'll need to create a stealth PayPal account. Can the country of the PayPal account be any country or does it have to be a UK PayPal account? If so I take it you're receiving money through eBay.
If this is the case then you'll have to get a new IP, fake address, fake name, etc. With these details you'll need to create a new UK PayPal account and then use that account to the limit is used up and then repeat the process, this is however pretty risky as it's very easy for you to slip up and then PayPal will limit all your accounts. PayPal also limit new accounts that receive lots of payments or payments of a high value. So with a new account you'd need to slowly build up your transaction history by receiving 1-2 small payments a day. You have no hope of verifying a UK PayPal account without real details, because in with a UK PayPal account you need a real UK bank account, a real UK phone number, a real UK visa card, etc. No one will be able to provide you with a UK phone number, let alone a UK VBA (Virtual Bank Account), anyone who can offer you this is a scammer.
If however the country of the PayPal account doesn't matter then I recommend you to go for a USA account. I'd say USA accounts are the easiest to verify plus there's no shortage of legit suppliers who can provide fully verified USA PayPal accounts, in fact there's a couple of suppliers in the BST section on this forum. They can probably guide you on how to safely use the account without getting it limited.
One other option is for you to keep any eye out in the Joint Venture section, every now and again a person will crop up offering the use of a UK PayPal and eBay account, you could do a JV with someone. When you get enough quality posts and time on this forum that might be an idea for you if you still need a UK verified PayPal account with no limits.