Personally I use a Mac specialist when it comes to support, servicing or a repair for my Apple laptop - LMR - they're fast, reliable, inexpensive plus they provide a collection service which really suits my needs. They're also available at the weekend. Well recommended.
If any requires IT Support in the London area, I recommend Unilink Systems. We work with small to medium businesses in and around London, specialising in IT Infrastructure, Implementation, Cloud Services, Internet and Telephony, Backups, Disaster Recovery etc.
Please call us on 020 7036 3800 for more information!