Completion of PHP based website

This work MUST be completed in our offices in Reading, Berskshire, UK. Please do not respond to the post unless you able to spend 2-5 days in our offices. We have a website that has been developed in PHP / CAKE. It is about 90% complete, designed by us and built by an external developer. We now need someone to come in to our office in Reading, Berskshire, UK and work with us and the client to tidy up the few odds and ends that are left (a few formatting issues, cross-browser checking and fixing, a few bug fixes). The site in question features a custom picture frame design engine. This is the area we need completed. The website allows a customer to select options to design a custom picture frame, and with each option a live visualisation is updated alongside. We need someone who can hit the ground running, jump in and make these last few tweaks to satisfy the client. Most of the engine is built, its just a case of tidying up really.