Try asking Simon one of the partners in 'Venli' they are the estate agents in Callao, they have building company & a window company 'Meridian'
It would be best to go in person to the workshop just above the end of the Motorway roundabout at 8.30am -9am you will catch him there then.
(There is a huge sign 'Venli' over a little to the left & back from the roundabout, workshop is underneath, go straight over roundabout coming from Callao, towards Mercadonna, at the mini roundabout take 3rd exit, they are along there on the right)
Hope this helps
