Mine is booked in for April at an estimated cost of approx £350 for standard service + any additional parts
Hopefully you had a mild winter on the canal and she didn't freeze.

We had down to -5c on the South Coast so any plain fresh water may have frozen. From what you said previously I think you were debating whether or not to winterise her because you wanted to use her. As Colin said £350 would be there or thereabouts depending upon labour charge and what is deemed standard service.
I think you said you were handy with spanners, if so check this out......all priced as Genuine parts rounded up.
Engine Oil x 2 @ 3.8l each £60
Quicksilver oil filter £12
Quicksilver Fuel filter £10
Spark Plugs x 6 £21
2-4-C Grease £9
Gear Oil Sterndrive x 2 946ml £36
Lube pump £7
Washers for Sterndrive oil plugs 3.50
SUB TOTAL £158.50
If you want to drop the leg to inspect the impeller and gimbal bearing add these.....
Sterndrive Gasket set £15
Impeller £40
Anode Kit £66
Lube pump £7
Plus an impeller gasket or two.
Oh and a good oil suction pump, not a cheap and nasty one but a good Pela or similar.