I have a list of around 3,600 mortgage brokers and IFA's on excel spreadsheet . I understand that these lists normally sell for around £100-£200 /000.

You can have the lot for £195. it is a list I bought at the end of January for a mailing campaign but changed my business model so I no longer need them.
They are from a reliable source, and it's only £195 instead of £3-£400 !!