import re
finalcontent=' £2,500 and also £ 1200 and also £ 7,645 and finally £8888 and london'
print( re.findall(r'£\s*(\d+(?:\.\d+)?)',finalcontent.replace(',','')) )
aW1wb3J0IHJlCgpmaW5hbGNvbnRlbnQ9JyDCozIsNTAwIGFuZCBhbHNvIMKjIDEyMDAgYW5kIGFsc28gwqMgNyw2NDUgYW5kIGZpbmFsbHkgwqM4ODg4IGFuZCBsb25kb24nCnByaW50KCByZS5maW5kYWxsKHInwqNccyooXGQrKD86XC5cZCspPyknLGZpbmFsY29udGVudC5yZXBsYWNlKCcsJywnJykpICkK